Add option to set emoji preferences behind feature flag (#35282)

config/locales/en.yml

@@ -1349,6 +1349,10 @@ en:
     basic_information: Basic information
     hint_html: "<strong>Customize what people see on your public profile and next to your posts.</strong> Other people are more likely to follow you back and interact with you when you have a filled out profile and a profile picture."
     other: Other
+  emoji_styles:
+    auto: Auto
+    native: Native
+    twemoji: Twemoji
   errors:
     '400': The request you submitted was invalid or malformed.
     '403': You don't have permission to view this page.

config/locales/simple_form.en.yml

@@ -61,6 +61,7 @@ en:
         setting_display_media_default: Hide media marked as sensitive
         setting_display_media_hide_all: Always hide media
         setting_display_media_show_all: Always show media
+        setting_emoji_style: How to display emojis. "Auto" will try using native emoji, but falls back to Twemoji for legacy browsers.
         setting_system_scrollbars_ui: Applies only to desktop browsers based on Safari and Chrome
         setting_use_blurhash: Gradients are based on the colors of the hidden visuals but obfuscate any details
         setting_use_pending_items: Hide timeline updates behind a click instead of automatically scrolling the feed
@@ -241,6 +242,7 @@ en:
         setting_display_media_default: Default
         setting_display_media_hide_all: Hide all
         setting_display_media_show_all: Show all
+        setting_emoji_style: Emoji style
         setting_expand_spoilers: Always expand posts marked with content warnings
         setting_hide_network: Hide your social graph
         setting_missing_alt_text_modal: Show confirmation dialog before posting media without alt text