Fix Google Translate breaking web interface (#15610)

- marks the page as a whole as untranslatable
- still marks user text as translatable

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/views/home/index.html.haml

@@ -8,7 +8,7 @@
   = render_initial_state
   = javascript_pack_tag 'application', crossorigin: 'anonymous'
 
-.app-holder#mastodon{ data: { props: Oj.dump(default_props) } }
+.notranslate.app-holder#mastodon{ data: { props: Oj.dump(default_props) } }
   %noscript
     = image_pack_tag 'logo.svg', alt: 'Mastodon'
 

app/views/public_timelines/show.html.haml

@@ -14,4 +14,4 @@
     %p= t('about.browse_local_posts')
 
 #mastodon-timeline{ data: { props: Oj.dump(default_props.merge(local: !Setting.show_known_fediverse_at_about_page)) }}
-#modal-container
+.notranslate#modal-container

app/views/tags/show.html.haml

@@ -13,4 +13,4 @@
   %p= t('about.about_hashtag_html', hashtag: @tag.name)
 
 #mastodon-timeline{ data: { props: Oj.dump(default_props.merge(hashtag: @tag.name, local: @local)) }}
-#modal-container
+.notranslate#modal-container