i18n: sync locales from zh-CN source

[SUSRDev]

Summary

• sync locale resources from zh-CN as the source of truth
• keep translation style standard, strict, and suitable for UI strings
• refine the additional locale drafts and fix a small batch of corrupted source strings in zh-CN

Included locales

• zh-CN
• en-US
• ja-JP
• ko-KR
• fr-FR
• de-DE
• es-ES
• ru-RU
• pt-BR
• it-IT
• tr-TR
• pl-PL
• nl-NL
• ar-SA
• th-TH

Notes

• placeholders/specifiers were preserved
• some long help/technical strings may still benefit from native-speaker cleanup
• this PR supersedes the previous cross-repo PR version