diff --git a/src/lang/en_GB.json b/src/lang/en_GB.json
index 0f80eb4..65379a8 100644
--- a/src/lang/en_GB.json
+++ b/src/lang/en_GB.json
@@ -1,10 +1,10 @@
 {
     "compose_placeholders": [
-        "What's cooking, $1?",
+        "What's cooking, %1?",
         "Speak your mind!",
         "Federate something...",
         "I sure love posting!",
-        "Another day, another $1 post!"
+        "Another day, another %1 post!"
     ],
 
     "login": {
@@ -84,6 +84,29 @@
         }
     },
 
+    "logs": {
+        "logged_in": "Logged in as %1",
+        "server_detected": "Server detected as %1 (%2) with capabilities: {%3}}",
+        "server_unsupported": "Server %1 is unsupported (%2). Things may break, or not work as expected",
+        "no_hostname": "Attempted to connect to a server without providing a hostname",
+        "no_https": "Cowardly refusing to connect to an insecure server",
+        "connection_failed": "Failed to connect to %1",
+        "post_fetch_failed": "Failed to fetch post %1",
+        "post_parse_failed": "Failed to parse post",
+        "post_parse_failed_id": "Failed to parse post %1",
+        "token_revoke_failed": "Token revocation failed! Dumping data anyways",
+        "sound_does_not_exist": "Attempted to play sound \"%1\", which does not exist!",
+        "account_data_empty": "Attempted to parse account data but no data was provided",
+        "timeline_fetch_failed": "Failed to retrieve timeline."
+    },
+
+    "error": {
+        "bad_request": "Bad request",
+        "invalid_auth_code": "Invalid auth code provided",
+        "connection_failed": "Failed to connect to <code>%1</code>.",
+        "post_fetch_failed": "Failed to retrieve post <code>%1</code>."
+    },
+
     "compose": "Post",
     "search": "Search",
     "loading": "just a moment...",
diff --git a/src/lib/account.js b/src/lib/account.js
index 7bfd696..394fe0f 100644
--- a/src/lib/account.js
+++ b/src/lib/account.js
@@ -1,6 +1,9 @@
 import { server } from '$lib/client/server.js';
 import { parseEmoji, renderEmoji } from '$lib/emoji.js';
 import { get, writable } from 'svelte/store';
+import Lang from '$lib/lang';
+
+const lang = Lang('en_GB');
 
 const cache = writable({});
 
@@ -11,7 +14,7 @@ const cache = writable({});
  */
 export function parseAccount(data) {
     if (!data) {
-        console.error("Attempted to parse account data but no data was provided");
+        console.error(lang.string('logs.account_data_empty'));
         return null;
     }
     let account = get(cache)[data.id];
@@ -20,7 +23,7 @@ export function parseAccount(data) {
 
     account = {};
     account.id = data.id;
-    account.nickname = data.display_name.trim();
+    account.nickname = data.display_name.trim().replaceAll('<', '&lt;').replaceAll('>', '&gt;');
     account.username = data.username;
     account.name = account.nickname || account.username;
     account.avatar_url = data.avatar;
@@ -31,6 +34,8 @@ export function parseAccount(data) {
     else
         account.host = get(server).host;
 
+    account.fqn = data.fqn || account.username + account.host;
+
     account.mention = "@" + account.username;
     if (account.host != get(server).host)
         account.mention += "@" + account.host;
diff --git a/src/lib/client/server.js b/src/lib/client/server.js
index 6b42ffe..3c85647 100644
--- a/src/lib/client/server.js
+++ b/src/lib/client/server.js
@@ -35,11 +35,11 @@ server.subscribe(server => {
  */
 export async function createServer(host) {
     if (!host) {
-        console.error("Attempted to create server without providing a hostname");
+        console.error(lang.string('logs.no_hostname'));
         return false;
     }
     if (host.startsWith("http://")) {
-        console.error("Cowardly refusing to connect to an insecure server");
+        console.error(lang.string('logs.no_https'));
         return false;
     }
 
@@ -49,7 +49,7 @@ export async function createServer(host) {
     if (host.startsWith("https://")) host = host.substring(8);
     const data = await api.getInstance(host);
     if (!data) {
-        console.error(`Failed to connect to ${host}`);
+        console.error(lang.string('logs.connection_failed', host));
         return false;
     }
 
@@ -58,9 +58,9 @@ export async function createServer(host) {
     server.capabilities = getCapabilities(server.type);
 
     if (server.type === server_types.UNSUPPORTED) {
-        console.warn(`Server ${host} is unsupported (${server.version}). Things may break, or not work as expected`);
+        console.warn(lang.string('logs.server_unsupported', host, server.version));
     } else {
-        console.log(`Server detected as "${server.type}" (${server.version}) with capabilities: {${server.capabilities.join(', ')}}`);
+        console.log(lang.string('logs.server_detected', server.type, server.version, server.capabilities.join(', ')));
     }
 
     return server;
diff --git a/src/lib/lang.js b/src/lib/lang.js
index 8e90901..955a749 100644
--- a/src/lib/lang.js
+++ b/src/lib/lang.js
@@ -19,7 +19,7 @@ export default function init(lang) {
 
     i18n.lang = language;
     i18n.lang_code = lang;
-    i18n.string = function(/* @type string */ key) {
+    i18n.string = function(/* @type string */ key, ...args) {
         const tokens = key.split('.');
         
         let i = 0;
@@ -32,10 +32,20 @@ export default function init(lang) {
                 return key;
             }
             if (typeof res === 'string' || res instanceof String)
-                return res;
+                break;
             i++;
             token = tokens[i];
         }
+
+        i = 1;
+        while (true) {
+            if (args.length < i || !res.includes('%' + i))
+                break;
+            res = res.replaceAll('%' + i, args[i - 1]);
+            i++;
+        }
+
+        return res;
     }
     i18n.stringArray = function(/* @type string */ key) {
         const tokens = key.split('.');
diff --git a/src/lib/sound.js b/src/lib/sound.js
index 377b833..9c94547 100644
--- a/src/lib/sound.js
+++ b/src/lib/sound.js
@@ -1,3 +1,7 @@
+import Lang from '$lib/lang';
+
+const lang = Lang('en_GB');
+
 import sound_log from '../sound/log.ogg';
 import sound_hello from '../sound/hello.ogg';
 import sound_success from '../sound/success.ogg';
@@ -16,7 +20,7 @@ export function playSound(name) {
     if (!name) name = "default";
     const sound = sounds[name];
     if (!sound) {
-        console.warn(`Attempted to play sound "${name}", which does not exist!`);
+        console.warn(lang.string('lang.sound_does_not_exist', name));
         return;
     }
     sound.pause();
diff --git a/src/lib/time.js b/src/lib/time.js
index 9a1c4eb..99811bf 100644
--- a/src/lib/time.js
+++ b/src/lib/time.js
@@ -21,6 +21,6 @@ export function shorthand(date) {
         unit = denoms[index].unit;
     }
     if (value > 0)
-        return lang.string('post.time').replaceAll('%1', Math.floor(value) + unit);
+        return lang.string('post.time', Math.floor(value) + unit);
     return "in " + Math.floor(value) + unit;
 }
diff --git a/src/lib/timeline.js b/src/lib/timeline.js
index ae8a5e3..03e5052 100644
--- a/src/lib/timeline.js
+++ b/src/lib/timeline.js
@@ -3,9 +3,12 @@ import { server } from '$lib/client/server.js';
 import { app } from '$lib/client/app.js';
 import { get, writable } from 'svelte/store';
 import { parsePost } from '$lib/post.js';
+import Lang from '$lib/lang';
 
 export const timeline = writable([]);
 
+const lang = Lang('en_GB');
+
 let loading = false;
 
 export async function getTimeline(clean) {
@@ -24,7 +27,7 @@ export async function getTimeline(clean) {
     );
 
     if (!timeline_data) {
-        console.error(`Failed to retrieve timeline.`);
+        console.error(lang.string('logs.timeline_fetch_failed'));
         loading = false;
         return;
     }
@@ -37,10 +40,10 @@ export async function getTimeline(clean) {
         if (!post) {
             if (post === null || post === undefined) {
                 if (post_data.id) {
-                    console.warn("Failed to parse post #" + post_data.id);
+                    console.warn(lang.string('logs.post_parse_failed_id', post_data.id));
                 } else {
-                    console.warn("Failed to parse post:");
-                    console.warn(post_data);
+                    console.warn(lang.string('logs.post_parse_failed'));
+                    console.debug(post_data);
                 }
             }
             continue;
diff --git a/src/lib/ui/Composer.svelte b/src/lib/ui/Composer.svelte
index 2d5d231..7859a7e 100644
--- a/src/lib/ui/Composer.svelte
+++ b/src/lib/ui/Composer.svelte
@@ -32,7 +32,7 @@
 
     const placeholders = lang.stringArray('compose_placeholders');
     let placeholder = Array.isArray(placeholders) ? placeholders[Math.floor(placeholders.length * Math.random())]
-        .replaceAll("$1", $account.username) : placeholders;
+        .replaceAll("%1", $account.username) : placeholders;
 
     const dispatch = createEventDispatcher();
 
diff --git a/src/lib/ui/Navigation.svelte b/src/lib/ui/Navigation.svelte
index e977153..96f4879 100644
--- a/src/lib/ui/Navigation.svelte
+++ b/src/lib/ui/Navigation.svelte
@@ -72,7 +72,7 @@
         );
 
         if (!res.ok)
-            console.warn("Token revocation failed! Dumping data anyways");
+            console.warn(lang.string('logs.token_revoke_failed'));
 
         account.set(false);
         app.set(false);
@@ -175,7 +175,7 @@
             <div class="account-name" aria-hidden="true">
                 <a href={$account.url} class="nickname" title={$account.nickname}>{@html $account.rich_name}</a>
                 <span class="username" title={`@${$account.username}@${$account.host}`}>
-                    {`@${$account.username}@${$account.host}`}
+                    {$account.fqn}
                 </span>
             </div>
         </div>
diff --git a/src/lib/ui/post/BoostContext.svelte b/src/lib/ui/post/BoostContext.svelte
index 0e7aed1..06677e0 100644
--- a/src/lib/ui/post/BoostContext.svelte
+++ b/src/lib/ui/post/BoostContext.svelte
@@ -13,7 +13,7 @@
     <span class="post-context-icon">🔁</span>
     <span class="post-context-action">
         { @html
-        lang.string('post.boosted').replaceAll('%1',
+        lang.string('post.boosted',
         `<a href={${post.account.url}} target="_blank"><span class="name">${post.account.rich_name}</span></a>`)
         }
     </span>
diff --git a/src/routes/+layout.svelte b/src/routes/+layout.svelte
index 8abb605..7f84883 100644
--- a/src/routes/+layout.svelte
+++ b/src/routes/+layout.svelte
@@ -28,7 +28,7 @@
         if (!data) return;
 
         account.set(parseAccount(data));
-        console.log(`Logged in as @${$account.username}@${$account.host}`);
+        console.log(lang.string('logs.logged_in', $account.fqn));
 
         // spin up async task to fetch notifications
         const notif_data = await api.getNotifications(
diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
index 6370b53..4776e7a 100644
--- a/src/routes/+page.svelte
+++ b/src/routes/+page.svelte
@@ -14,7 +14,7 @@
         if (account) getTimeline();
     });
 
-    document.addEventListener("scroll", () => {
+    document.addEventListener('scroll', () => {
         if ($account && $page.url.pathname !== "/") return;
         if (window.innerHeight + window.scrollY >= document.body.offsetHeight - 2048) {
             getTimeline();
diff --git a/src/routes/[server]/[account]/[post]/+page.svelte b/src/routes/[server]/[account]/[post]/+page.svelte
index 56a28a2..4ab384f 100644
--- a/src/routes/[server]/[account]/[post]/+page.svelte
+++ b/src/routes/[server]/[account]/[post]/+page.svelte
@@ -33,16 +33,16 @@
             // TODO: make `server` a key/value pair to support multiple servers
             server.set(await createServer(data.server_host));
             if (!$server) {
-                error = `Failed to connect to <code>${data.server_host}</code>.`;
-                console.error(`Failed to connect to ${data.server_host}.`);
+                error = lang.string('error.connection_failed', data.server_host);
+                console.error(lang.string('logs.connection_failed', data.server_host));
                 return;
             }
         }
 
         const post_data = await api.getPost($server.host, token, post_id);
         if (!post_data || post_data.error) {
-            error = `Failed to retrieve post <code>${post_id}</code>.`;
-            console.error(`Failed to retrieve post ${post_id}.`);
+            error = lang.string('error.post_fetch_failed', post_id);
+            console.error(lang.string('logs.post_fetch_failed', post_id));
             return;
         }
         let post = await parsePost(post_data, 0);
@@ -83,9 +83,9 @@
                     <Button centered on:click={() => {goto(previous_page)}}>{lang.string('navigation.back')}</Button>
                 </nav>
             {/if}
-            <img src={post.account.avatar_url} type={post.account.avatar_type || "image/png"} alt="" width="40" height="40" class="header-avatar" loading="lazy" decoding="async">
+            <img src={post.account.avatar_url} type={post.account.avatar_type || 'image/png'} alt="" width="40" height="40" class="header-avatar" loading="lazy" decoding="async">
             <h1>
-                {@html lang.string('post.by').replaceAll('%1', post.account.rich_name)}
+                {@html lang.string('post.by', post.account.rich_name)}
             </h1>
         </header>
         
diff --git a/src/routes/callback/+page.svelte b/src/routes/callback/+page.svelte
index 8b6985e..8d9d0f8 100644
--- a/src/routes/callback/+page.svelte
+++ b/src/routes/callback/+page.svelte
@@ -8,17 +8,20 @@
     import { error } from '@sveltejs/kit';
     import { unread_notif_count, last_read_notif_id } from '$lib/notifications.js';
     import { account } from '$lib/stores/account.js';
+    import Lang from '$lib/lang';
 
     export let data;
 
+    const lang = Lang('en_GB');
+
     let auth_code = data.code;
 
     if (!auth_code || !get(server) || !get(app)) {
-        error(400, { message: "Bad request" });
+        error(400, { message: lang.string('error.bad_request') });
     } else {
         api.getToken(get(server).host, get(app).id, get(app).secret, auth_code).then(token => {
             if (!token) {
-                error(400, { message: "Invalid auth code provided" });
+                error(400, { message: lang.string('error.invalid_auth_code') });
             }
 
             app.update(app => {
@@ -30,7 +33,7 @@
                 if (!data) return goto("/");
 
                 account.set(parseAccount(data));
-                console.log(`Logged in as @${get(account).username}@${get(account).host}`);
+                console.log(lang.string('logs.logged_in', get(account).fqn));
 
                 // spin up async task to fetch notifications
                 return api.getNotifications(