web: move all strings to i18n & improve a11y

- omnibox is now fully usable with a screen reader
- back button is now interpreted as such
- subtext now accepts line breaks

web/src/components/settings/SettingsSection.svelte

@@ -1,9 +1,11 @@
 <script lang="ts">
+    import { t } from "$lib/i18n/translations";
+
     export let sectionTitle: string;
 </script>
 
 <section id="settings-section">
-    <div id="settings-section-title">{sectionTitle}</div>
+    <div id="settings-section-title">{$t(`settings.section.${sectionTitle}`)}</div>
     <div id="settings-section-categories">
         <slot></slot>
     </div>

web/src/components/settings/SettingsTab.svelte

@@ -1,6 +1,8 @@
 <script lang="ts">
     import { page } from "$app/stores";
 
+    import { t } from "$lib/i18n/translations";
+
     import IconChevronRight from "@tabler/icons-svelte/IconChevronRight.svelte";
 
     export let tabName: string;
@@ -20,7 +22,7 @@
         <div class="tab-icon" style="background: var(--{iconColor})">
             <slot></slot>
         </div>
-        <span>{tabName}</span>
+        <span>{$t(`settings.page.${tabName}`)}</span>
     </div>
     <div class="settings-tab-chevron">
         <IconChevronRight />