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/upload-board/UploadBoard.tsx

@@ -1,4 +1,5 @@
 import React, { MutableRefObject, ReactNode, useImperativeHandle, useRef } from 'react';
+import { useTranslation } from 'react-i18next';
 import { Badge, Box, Chip, Header, Icon, Icons, Spinner, Text, as, percent } from 'folds';
 import classNames from 'classnames';
 import { useAtomValue } from 'jotai';
@@ -43,6 +44,7 @@ export function UploadBoardHeader({
   onSend,
   imperativeHandlerRef,
 }: UploadBoardHeaderProps) {
+  const { t } = useTranslation();
   const sendingRef = useRef(false);
   const uploads = useAtomValue(uploadFamilyObserverAtom);
 
@@ -88,7 +90,7 @@ export function UploadBoardHeader({
         gap="100"
       >
         <Icon src={open ? Icons.ChevronTop : Icons.ChevronRight} size="50" />
-        <Text size="H6">Files</Text>
+        <Text size="H6">{t('Organisms.UploadBoard.files')}</Text>
       </Box>
       <Box className={css.UploadBoardHeaderContent} alignItems="Center" gap="100">
         {isSuccess && (
@@ -100,12 +102,12 @@ export function UploadBoardHeader({
             outlined
             after={<Icon src={Icons.Send} size="50" filled />}
           >
-            <Text size="B300">Send</Text>
+            <Text size="B300">{t('Organisms.UploadBoard.send')}</Text>
           </Chip>
         )}
         {isError && !open && (
           <Badge variant="Critical" fill="Solid" radii="300">
-            <Text size="L400">Upload Failed</Text>
+            <Text size="L400">{t('Organisms.UploadBoard.upload_failed')}</Text>
           </Badge>
         )}
         {!isSuccess && !isError && !open && (