document description can't render emoji

[akkuman]

• Gitea version (or commit ref):
• Git version:
• Operating system:
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (https://try.gitea.io/Akkuman/test_commit_emoji)
  • No
  • Not relevant
• Log gist:

Description

document description can't render emoji

Screenshots

[lunny]

should be closed by #5168