reverse proxy authentication do not use user's language setting

[browcio]

• Gitea version (or commit ref): 1.9.0
• Git version: 2.17.1
• Operating system: ubuntu 18.04
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
  • Not relevant
• Log gist:

Description

We have Gitea configured to use reverse proxy authentication. One user would like to use English instead of his native language in Gitea's interface.

When user logs in using reverse proxy, Gitea sets interface language based on browser headers (I guess?), ignoring settings from user profile. If user then goes to user settings, desired language is chosen in language section but interface do not use it. "Update profile" changes language to selected.

When user logs in directly to Gitea (bypassing reverse proxy), language setting from user's profile is used.

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