diff --git a/static/pico.min.css b/static/css/pico.min.css
similarity index 100%
rename from static/pico.min.css
rename to static/css/pico.min.css
diff --git a/static/index.html b/static/index.html
index 94e4025..c07fb2c 100644
--- a/static/index.html
+++ b/static/index.html
@@ -1,126 +1,111 @@
 <!doctype html>
 
-<html lang="">
+<html>
     <head>
         <meta charset="UTF-8" />
         <meta name="viewport" content="width=device-width,initial-scale=1" />
         <!--<link rel="icon" href="favicon.png" />-->
         <title>PassED</title>
 
-        <script src="/crypto.js"></script>
-        <script src="/api.js"></script>
-        <script src="/index.js" defer></script>
-        <link rel="stylesheet" href="/pico.min.css" />
+        <link rel="stylesheet" href="/css/pico.min.css" />
+
+        <script src="/js/lang.js"></script>
+        <script src="/js/api.js"></script>
+        <script src="/js/crypto.js"></script>
+        <script src="/js/main.js"></script>
     </head>
-        <nav class="container-fluid">
+        <nav class="container">
             <ul>
                 <li>
-                    <strong>PassED</strong>
+                    <strong t="title"></strong>
                 </li>
             </ul>
 
             <ul>
                 <li>
-                    <a href="https://git.1e99.eu/1e99/passed">Git</a>
+                    <a href="https://git.1e99.eu/1e99/passed/" t="source-code"></a>
+                </li>
+
+                <li>
+                    <details class="dropdown">
+                        <summary t="language"></summary>
+                        <ul dir="rtl">
+                            <li t="language-en" class="select-language" data-lang="en"></li>
+                            <li t="language-de" class="select-language" data-lang="de"></li>
+                        </ul>
+                    </details>
                 </li>
             </ul>
         </nav>
 
         <main class="container">
             <article>
-                <header>Enter Password</header>
+                <header t="enter-password"></header>
 
                 <form id="enter-password">
-                    <label>
-                        Password
-                        <textarea name="password"></textarea>
-                    </label>
+                    <fieldset id="enter-password">
+                        <label>
+                            <span t="password"></span>
+                            <textarea name="password"></textarea>
+                        </label>
 
-                    <label>
-                        Expires in
-                        <select name="expires-in">
-                            <option value="3600" selected>1 Hour</option>
-                            <option value="43200">12 Hours</option>
-                            <option value="86400">1 Day</option>
-                            <option value="604800">1 Week</option>
-                            <option value="1209600">2 Weeks</option>
-                        </select>
-                    </label>
+                        <label>
+                            <span t="expires-in"></span>
+                            <select name="expires-in">
+                                <option value="3600" selected t="expires-in.1-hour"></option>
+                                <option value="43200" t="expires-in.12-hours"></option>
+                                <option value="86400" t="expires-in.1-day"></option>
+                                <option value="604800" t="expires-in.1-week"></option>
+                                <option value="1209600" t="expires-in.2-weeks"></option>
+                            </select>
+                        </label>
+                    </fieldset>
 
-                    <button type="submit">Generate URL</button>
+                    <button type="submit" id="enter-password" t="generate-link"></button>
                 </form>
             </article>
         </main>
 
-        <dialog id="url-dialog">
+        <dialog id="link">
             <article>
-                <header>Password URL</header>
-
+                <header t="share-link"></header>
                 <fieldset role="group">
-                    <input id="url" readonly autofocus />
-                    <button id="url-copy">Copy</button>
+                    <input readonly id="link"/>
+                    <button t="copy" id="link-copy"></button>
                 </fieldset>
-
                 <footer>
-                    <button id="url-close">Close</button>
-                </footer>
-            </article>
-        </dialog>
-
-        <dialog id="view-dialog">
-            <article>
-                <header>View Password</header>
-
-                <textarea readonly id="view-password" input></textarea>
-
-                <footer>
-                    <button id="view-close">Close</button>
-                </footer>
-            </article>
-        </dialog>
-
-        <dialog id="confirm-view-dialog">
-            <article>
-                <header>View Password</header>
-
-                <p>You may only reveal the password once.</p>
-
-                <footer>
-                    <button id="view-cancel" class="secondary">
-                        Cancel
-                    </button>
-                    <button id="view-confirm">Confirm</button>
+                    <button class="secondary" id="link-close" t="close"></button>
                 </footer>
             </article>
         </dialog>
 
         <dialog id="not-found">
             <article>
-                <header>Password does not exist</header>
-
-                <p>
-                    The password you requested may have expired, been viewed
-                    before or never even existed in the first place.
-                </p>
-
+                <header t="not-found"></header>
+                <p t="not-found-reason"></p>
                 <footer>
-                    <button id="not-found-close" class="secondary">Close</button>
+                    <button t="close" id="not-found-close"></button>
                 </footer>
             </article>
         </dialog>
 
-        <dialog id="loading-dialog">
-            <h1>Loading...</h1>
+        <dialog id="confirm">
+            <article>
+                <header t="reveal-password"></header>
+                <p t="reveal-password-once"></p>
+                <footer>
+                    <button class="secondary" t="close" id="confirm-close"></button>
+                    <button t="ok" id="confirm-ok"></button>
+                </footer>
+            </article>
         </dialog>
 
-        <dialog id="error-dialog">
+        <dialog id="view">
             <article>
-                <header>Error</header>
-
-                <textarea id="error" readonly></textarea>
-
+                <header t="password"></header>
+                <textarea readonly id="view-password"></textarea>
                 <footer>
-                    <button id="error-reload">Reload the page</button>
+                    <button t="close" id="view-close"></button>
                 </footer>
             </article>
         </dialog>
diff --git a/static/index.js b/static/index.js
deleted file mode 100644
index a202f10..0000000
--- a/static/index.js
+++ /dev/null
@@ -1,218 +0,0 @@
-const loadingDialog = {
-  dialog: document.querySelector("dialog#loading-dialog"),
-  init() {
-    this.dialog.addEventListener("cancel", (ev) => {
-      ev.preventDefault();
-    });
-  },
-  show() {
-    this.dialog.showModal();
-  },
-  close() {
-    this.dialog.close();
-  },
-};
-
-const errorDialog = {
-  dialog: document.querySelector("dialog#error-dialog"),
-  error: document.querySelector("textarea#error"),
-  reload: document.querySelector("button#error-reload"),
-  init() {
-    this.dialog.addEventListener("close", (ev) => {
-      window.location.reload();
-    });
-
-    this.reload.addEventListener("click", (ev) => {
-      window.location.href = "/";
-    });
-  },
-  show(err) {
-    this.error.value = err;
-    console.error(err);
-    this.dialog.showModal();
-  },
-};
-
-const urlDialog = {
-  dialog: document.querySelector("dialog#url-dialog"),
-  url: document.querySelector("input#url"),
-  urlCopy: document.querySelector("button#url-copy"),
-  close: document.querySelector("button#url-close"),
-  init() {
-    this.dialog.addEventListener("close", (ev) => {});
-
-    this.urlCopy.addEventListener("click", (ev) => {
-      this.url.select();
-      this.url.setSelectionRange(0, 99999);
-      navigator.clipboard.writeText(this.url.value);
-    });
-
-    this.close.addEventListener("click", (ev) => {
-      this.dialog.close();
-    });
-  },
-  show(url) {
-    this.url.value = url;
-    this.dialog.showModal();
-  },
-};
-
-const notFoundDialog = {
-  dialog: document.querySelector("dialog#not-found"),
-  close: document.querySelector("button#not-found-close"),
-  init() {
-    this.dialog.addEventListener("close", (ev) => {
-      window.location.hash = "";
-      window.location.reload();
-    });
-
-    this.close.addEventListener("click", (ev) => {
-      window.location.hash = "";
-      window.location.reload();
-    });
-  },
-  show() {
-    this.dialog.showModal();
-  },
-};
-
-const viewDialog = {
-  dialog: document.querySelector("dialog#view-dialog"),
-  password: document.querySelector("textarea#view-password"),
-  close: document.querySelector("button#view-close"),
-  init() {
-    this.dialog.addEventListener("close", (ev) => {
-      window.location.hash = "";
-      window.location.reload();
-    });
-
-    this.close.addEventListener("click", (ev) => {
-      this.dialog.close();
-    });
-  },
-  show(password) {
-    this.password.value = password;
-    this.dialog.showModal();
-  },
-};
-
-const confirmViewDialog = {
-  dialog: document.querySelector("dialog#confirm-view-dialog"),
-  cancel: document.querySelector("button#view-cancel"),
-  confirm: document.querySelector("button#view-confirm"),
-  resolve: null,
-  reject: null,
-  init() {
-    this.dialog.addEventListener("cancel", (ev) => {
-      this.dialog.close();
-      this.resolve(false);
-    });
-
-    this.cancel.addEventListener("click", (ev) => {
-      this.dialog.close();
-      this.resolve(false);
-    });
-
-    this.confirm.addEventListener("click", (ev) => {
-      this.dialog.close();
-      this.resolve(true);
-    });
-  },
-  show() {
-    return new Promise((resolve, reject) => {
-      this.resolve = resolve;
-      this.reject = reject;
-      this.dialog.showModal();
-    });
-  },
-};
-
-async function viewPassword() {
-  try {
-    loadingDialog.show();
-
-    let id, key, iv;
-
-    // We need to be backwards compatible with old links that still use the query
-    if (window.location.search.trim() != "") {
-      const params = new URLSearchParams(window.location.search);
-      id = params.get("id");
-      key = params.get("key");
-      iv = params.get("iv");
-    } else {
-      // Need to remove leading "#"
-      const hash = window.location.hash.substring(1);
-      const split = hash.split(":");
-      id = split[0];
-      key = split[1];
-      iv = split[2];
-    }
-
-    const exists = await hasPassword(id);
-    if (!exists) {
-      notFoundDialog.show();
-      return;
-    }
-
-    const shouldView = await confirmViewDialog.show();
-    if (!shouldView) {
-      // This is needed for the redirect, otherwise the user won't get redirected
-      setTimeout(() => {
-        window.location.hash = "";
-        window.location.reload();
-      }, 0);
-      return;
-    }
-
-    const encrypted = await getPassword(id);
-    const password = await decryptPassword(encrypted, key, iv);
-
-    viewDialog.show(password);
-  } catch (error) {
-    errorDialog.show(error);
-  } finally {
-    loadingDialog.close();
-  }
-}
-
-const enterPassword = document.querySelector("form#enter-password");
-
-enterPassword.addEventListener("submit", async (ev) => {
-  try {
-    loadingDialog.show();
-    ev.preventDefault();
-    const data = new FormData(ev.target);
-
-    const password = await encryptPassword(data.get("password"));
-    const id = await uploadPassword(
-      password.password,
-      parseInt(data.get("expires-in")),
-    );
-
-    const url = new URL(window.location);
-    url.hash = [id, password.key, password.iv].join(":");
-    urlDialog.show(url.toString());
-  } catch (error) {
-    errorDialog.show(error);
-  } finally {
-    loadingDialog.close();
-  }
-});
-
-loadingDialog.init();
-errorDialog.init();
-urlDialog.init();
-notFoundDialog.init();
-viewDialog.init();
-confirmViewDialog.init();
-
-const hash = window.location.hash;
-if (hash.trim() != "") {
-  viewPassword();
-}
-
-// We need to be backwards compatible with the old links
-const query = window.location.search;
-if (query.trim() != "") {
-  viewPassword();
-}
diff --git a/static/api.js b/static/js/api.js
similarity index 91%
rename from static/api.js
rename to static/js/api.js
index 1a2b00d..5c9d776 100644
--- a/static/api.js
+++ b/static/js/api.js
@@ -1,6 +1,7 @@
 /** Upload a password to the server
  * @param {string} password Encryptes password
- * @param {Promise<number>} expiresIn Number of seconds in which the password will expire
+ * @param {number} expiresIn Number of seconds in which the password will expire
+ * @returns {Promise<string>}
  */
 async function uploadPassword(password, expiresIn) {
   const res = await fetch("/api/password", {
@@ -36,6 +37,7 @@ async function hasPassword(id) {
 
   throw new Error(`Failed to check if password exists: ${res.status}: ${msg}`);
 }
+
 /** Get a password from the server
  * @param {string} id Password ID
  * @returns {Promise<string>}
diff --git a/static/crypto.js b/static/js/crypto.js
similarity index 100%
rename from static/crypto.js
rename to static/js/crypto.js
diff --git a/static/js/lang.js b/static/js/lang.js
new file mode 100644
index 0000000..76488ac
--- /dev/null
+++ b/static/js/lang.js
@@ -0,0 +1,70 @@
+const LANGUAGE_KEY = "language";
+const languages = {};
+let language = "en";
+
+/**
+ * @param {string} lang
+ */
+async function setLanguage(lang) {
+  if (languages[lang] == undefined) {
+    const res = await fetch(`/lang/${lang}.json`);
+    const json = await res.json();
+
+    languages[lang] = json;
+  }
+
+  language = lang;
+  translatePage();
+  localStorage.setItem(LANGUAGE_KEY, lang);
+}
+
+/** Translates a key
+ * @param {string} key
+ * @param {any} args
+ * @returns {string}
+ */
+function translate(key, ...args) {
+  const bundle = languages[language];
+  let value = bundle[key];
+  if (value == undefined) {
+    value = key;
+  }
+
+  for (let i = 0; i < args.length; i++) {
+    value = value.replaceAll(`{${i}}`, args[i]);
+  }
+
+  return value;
+}
+
+function translatePage() {
+  const elements = document.getElementsByTagName("*");
+  for (const element of elements) {
+    const key = element.getAttribute("t");
+    if (key == null) {
+      continue;
+    }
+
+    element.innerHTML = translate(key);
+  }
+}
+
+function initLanguageButtons() {
+  const buttons = document.querySelectorAll("li.select-language");
+  for (const button of buttons) {
+    button.addEventListener("click", async (ev) => {
+      const self = ev.target;
+      const lang = self.getAttribute("data-lang");
+      await setLanguage(lang);
+    });
+  }
+}
+
+window.addEventListener("load", async () => {
+  const lang = localStorage.getItem(LANGUAGE_KEY);
+  if (lang != null) {
+    await setLanguage(lang);
+  }
+
+  initLanguageButtons();
+});
diff --git a/static/js/main.js b/static/js/main.js
new file mode 100644
index 0000000..ee3e683
--- /dev/null
+++ b/static/js/main.js
@@ -0,0 +1,118 @@
+function initEnterPassword() {
+  const form = document.querySelector("form#enter-password");
+  const fieldset = document.querySelector("fieldset#enter-password");
+  const submit = document.querySelector("button#enter-password");
+
+  const dialog = document.querySelector("dialog#link");
+  const link = document.querySelector("input#link");
+  const copy = document.querySelector("button#link-copy");
+  const close = document.querySelector("button#link-close");
+
+  form.addEventListener("submit", async (ev) => {
+    const data = new FormData(ev.target);
+    ev.preventDefault();
+
+    try {
+      fieldset.disabled = true;
+      submit.ariaBusy = "true";
+
+      const password = await encryptPassword(data.get("password"));
+
+      const id = await uploadPassword(
+        password.password,
+        parseInt(data.get("expires-in")),
+      );
+
+      const url = new URL(window.location.toString());
+      url.hash = [id, password.key, password.iv].join(":");
+
+      link.value = url.toString();
+      dialog.showModal();
+    } finally {
+      fieldset.disabled = false;
+      submit.ariaBusy = "false";
+      ev.target.reset();
+    }
+  });
+
+  dialog.addEventListener("close", (ev) => {
+    this.link.value = "";
+  });
+
+  copy.addEventListener("click", (ev) => {
+    link.select();
+    link.setSelectionRange(0, 99999);
+    navigator.clipboard.writeText(link.value);
+  });
+
+  close.addEventListener("click", (ev) => {
+    dialog.close();
+  });
+}
+
+async function confirmViewPassword() {
+  const dialog = document.querySelector("dialog#confirm");
+  const close = document.querySelector("button#confirm-close");
+  const ok = document.querySelector("button#confirm-ok");
+  const notFoundDialog = document.querySelector("dialog#not-found");
+  const notFoundClose = document.querySelector("button#not-found-close");
+
+  let hash = window.location.hash;
+  hash = hash.substring(1);
+  if (hash.trim() == "") {
+    return;
+  }
+
+  const [id, key, iv] = hash.split(":");
+  const has = await hasPassword(id);
+  if (!has) {
+    notFoundClose.addEventListener("click", () => notFoundDialog.close());
+    notFoundDialog.addEventListener("close", () => (window.location.hash = ""));
+
+    notFoundDialog.showModal();
+    return;
+  }
+
+  dialog.addEventListener("close", () => (window.location.hash = ""));
+
+  close.addEventListener("click", () => {
+    dialog.close();
+  });
+
+  ok.addEventListener("click", async () => {
+    try {
+      close.disabled = true;
+      ok.disabled = true;
+      ok.ariaBusy = "true";
+
+      const encryptedPassword = await getPassword(id);
+      const password = await decryptPassword(encryptedPassword, key, iv);
+
+      viewPassword(password);
+    } finally {
+      close.disabled = false;
+      ok.disabled = false;
+      ok.ariaBusy = "false";
+      dialog.close();
+    }
+  });
+
+  dialog.showModal();
+}
+
+async function viewPassword(password) {
+  const dialog = document.querySelector("dialog#view");
+  const viewPassword = document.querySelector("textarea#view-password");
+  const close = document.querySelector("button#view-close");
+
+  close.addEventListener("click", () => dialog.close());
+  dialog.addEventListener("close", () => (window.location.hash = ""), 0);
+
+  viewPassword.value = password;
+  dialog.showModal();
+}
+
+window.addEventListener("load", () => {
+  initEnterPassword();
+  confirmViewPassword();
+});
diff --git a/static/lang/de.json b/static/lang/de.json
new file mode 100644
index 0000000..37f93f1
--- /dev/null
+++ b/static/lang/de.json
@@ -0,0 +1,24 @@
+{
+  "title": "PassED",
+  "source-code": "Quellcode",
+  "language": "Sprache",
+  "language-en": "Englisch",
+  "language-de": "Deutsch",
+  "enter-password": "Passwort eingeben",
+  "password": "Passwort",
+  "expires-in": "Ablaufzeit",
+  "expires-in.1-hour": "1 Stunde",
+  "expires-in.12-hours": "12 Stunden",
+  "expires-in.1-day": "1 Tag",
+  "expires-in.1-week": "1 Woche",
+  "expires-in.2-weeks": "2 Wochen",
+  "generate-link": "Link erstellen",
+  "share-link": "Link teilen",
+  "not-found": "Passwort wurde nicht gefunden",
+  "not-found-reason": "Das von Ihnen angefragte Passwort ist vielleicht abgelaufen, wurde bereits angeschaut oder hat noch nie existiert.",
+  "reveal-password": "Passwort anschauen",
+  "reveal-password-once": "Sie können sich das Passwort nur einmal anschauen.",
+  "copy": "Kopieren",
+  "close": "Schließen",
+  "ok": "OK"
+}
diff --git a/static/lang/en.json b/static/lang/en.json
new file mode 100644
index 0000000..5fd8f2e
--- /dev/null
+++ b/static/lang/en.json
@@ -0,0 +1,24 @@
+{
+  "title": "PassED",
+  "source-code": "Source",
+  "language": "Language",
+  "language-en": "English",
+  "language-de": "German",
+  "enter-password": "Enter Password",
+  "password": "Password",
+  "expires-in": "Expires in",
+  "expires-in.1-hour": "1 Hour",
+  "expires-in.12-hours": "2 Hours",
+  "expires-in.1-day": "1 Day",
+  "expires-in.1-week": "1 Week",
+  "expires-in.2-weeks": "2 Weeks",
+  "generate-link": "Generate Link",
+  "share-link": "Share Link",
+  "not-found": "Password not found",
+  "not-found-reason": "The password you requested may have expired, been viewed before or never even existed in the first place.",
+  "reveal-password": "Reveal Password",
+  "reveal-password-once": "You may only reveal the password once",
+  "copy": "Copy",
+  "close": "Close",
+  "ok": "OK"
+}
