Audit facts

[krystofkomanec]

Summary

• add user-facing documentation for knowledge model source language and translations
• document translation management on knowledge model detail pages
• document questionnaire language selection during custom project creation and in project settings
• clarify that DSW UI locales/profile language are separate from knowledge model translations

Source

• Based on WEP0014: Translations for Knowledge Models
• Internal DB/API details from the WEP are intentionally not included in the user guide

Verification

• git diff --check
• make html