Locale
The UI language is not the same as the document language.
You can run an English ribbon on a Hindi DOCX. Proofing packs and fonts are separate problems. This handbook’s pages are translated copies of English; the suite’s language packs come from Kingsoft. This site is an independent handbook and is not affiliated with Kingsoft Office Software Corporation Limited.

Switching the ribbon
Look in settings for language or a downloadable UI pack. Restart the suite. If menus stay mixed, you still have two packs half-installed.
Proofing
Spellcheck needs the right dictionary. A missing pack looks like “everything is misspelled.” That is not a corrupt file.
RTL and CJK
Hebrew and Arabic documents need fonts that actually contain those glyphs. Linux users should read Linux fonts before blaming Writer.
This handbook versus the suite
Our pages exist in English plus generated Chinese, Russian, Hebrew, Japanese, and Hindi. That is not the same as installing a Kingsoft UI pack. If the ribbon is still mixed after a pack, you have two packs half-installed — restart fully.