docs: mention release reactions in the REACTIONS setting (#598)

Documents the `[ui] RELEASE_REACTIONS` setting added in https://github.com/go-gitea/gitea/pull/38415, which sets the reactions available on releases (default `+1, laugh, hooray, heart, rocket, eyes`). `REACTIONS` now only covers issues, pull requests and comments. Updated in English, 简体中文 and 繁體中文.

Reviewed-on: https://gitea.com/gitea/docs/pulls/598
Reviewed-by: silverwind <[email protected]>
Co-authored-by: Shudhanshu Singh <[email protected]>

docs/administration/config-cheat-sheet.md

@@ -270,9 +270,10 @@ The following configuration set `Content-Type: application/vnd.android.package-a
 - `FOLDER_ICON_THEME`: **basic**: The icon theme for folders (basic/material).
 - `MAX_DISPLAY_FILE_SIZE`: **8388608**: Max size of files to be displayed (default is 8MiB)
 - `AMBIGUOUS_UNICODE_DETECTION`: **true**: Detect ambiguous unicode characters in file contents and show warnings on the UI
-- `REACTIONS`: All available reactions users can choose on issues/prs and comments
+- `REACTIONS`: All available reactions users can choose on issues, pull requests and comments.
     Values can be emoji alias (:smile:) or a unicode emoji.
     For custom reactions, add a tightly cropped square image to public/assets/img/emoji/reaction_name.png
+- `RELEASE_REACTIONS`: **+1, laugh, hooray, heart, rocket, eyes**: Reactions available for releases, in the same format as `REACTIONS`.
 - `REACTION_MAX_USER_NUM`: **10**: Change the number of users that are displayed in reactions tooltip (triggered by mouse hover).
 - `CUSTOM_EMOJIS`: **gitea, codeberg, gitlab, git, github, gogs**: Additional Emojis not defined in the utf8 standard.
     By default, we support Gitea (:gitea:), to add more copy them to public/assets/img/emoji/emoji_name.png and