i18n: localize hardcoded UI strings across 10 components

Wraps the hardcoded strings flagged in LOTUS_BUGS.md (Localization rows)
in t() via react-i18next, and adds the keys to public/locales/en.json
under the existing Organisms.* namespace. de.json intentionally left to
fall back to en for now (fallbackLng: 'en') rather than fabricate
translations.

Files: CreateRoomTypeSelector, ImageViewer, MsgTypeRenderers (MLocation),
Reply (ThreadIndicator), ImageContent, DeviceVerification (5 subcomponents),
UrlPreviewCard (DiscordCard), InviteUserPrompt, UploadBoard, PasswordStage.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/components/invite-user-prompt/InviteUserPrompt.tsx

@@ -7,6 +7,7 @@ import React, {
   useRef,
   useState,
 } from 'react';
+import { useTranslation } from 'react-i18next';
 import {
   Overlay,
   OverlayBackdrop,
@@ -66,6 +67,7 @@ type InviteUserProps = {
   requestClose: () => void;
 };
 export function InviteUserPrompt({ room, requestClose }: InviteUserProps) {
+  const { t } = useTranslation();
   const mx = useMatrixClient();
   const modalStyle = useModalStyle(560);
   const alive = useAlive();
@@ -194,7 +196,7 @@ export function InviteUserPrompt({ room, requestClose }: InviteUserProps) {
               >
                 <Box grow="Yes">
                   <Text size="H4" truncate>
-                    Invite
+                    {t('Organisms.InviteUser.invite')}
                   </Text>
                 </Box>
                 <Box shrink="No" gap="100" alignItems="Center">
@@ -351,7 +353,7 @@ export function InviteUserPrompt({ room, requestClose }: InviteUserProps) {
                   disabled={!validUserId || inviting}
                   before={inviting && <Spinner size="200" variant="Primary" fill="Solid" />}
                 >
-                  <Text size="B400">Invite</Text>
+                  <Text size="B400">{t('Organisms.InviteUser.invite')}</Text>
                 </Button>
               </Box>
             </Box>