Make fork settings more clear

Signed-off-by: Sam Therapy <sam@samtherapy.net>

src/components/settings_modal/tabs/general_tab.vue

@@ -157,6 +157,7 @@
             {{ $t('settings.greentext') }}
           </BooleanSetting>
         </li>
+        <h3>{{ $t('settings.fork_changes') }}</h3>
         <li>
           <ChoiceSetting
             id="conversationDisplay"

src/i18n/en.json

@@ -505,6 +505,7 @@
     "mention_link_fade_domain": "Fade domains (e.g. @example.org in @foo@example.org)",
     "fun": "Fun",
     "greentext": "Meme arrows",
+    "fork_changes": "Fork changes",
     "notifications": "Notifications",
     "notification_setting_filters": "Filters",
     "notification_setting_block_from_strangers": "Block notifications from users who you do not follow",