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/image-viewer/ImageViewer.tsx

@@ -1,4 +1,5 @@
 import React from 'react';
+import { useTranslation } from 'react-i18next';
 import FileSaver from 'file-saver';
 import classNames from 'classnames';
 import { Box, Chip, Header, Icon, IconButton, Icons, Text, as } from 'folds';
@@ -15,6 +16,7 @@ export type ImageViewerProps = {
 
 export const ImageViewer = as<'div', ImageViewerProps>(
   ({ className, alt, src, requestClose, ...props }, ref) => {
+    const { t } = useTranslation();
     const { zoom, zoomIn, zoomOut, setZoom } = useZoom(0.2);
     const { pan, cursor, onMouseDown } = usePan(zoom !== 1);
 
@@ -69,7 +71,7 @@ export const ImageViewer = as<'div', ImageViewerProps>(
               radii="300"
               before={<Icon size="50" src={Icons.Download} />}
             >
-              <Text size="B300">Download</Text>
+              <Text size="B300">{t('Organisms.ImageViewer.download')}</Text>
             </Chip>
           </Box>
         </Header>