Harmy, since I'm sure you already have more than enough trusted people to help with English proofreading & editing, probably the most helpful thing I can do is reproduce the credits list of those who helped translate the subtitles for your Sourced Documentary awhile back ago.

Non-English subtitle translators for Sources Doc:

French translation: johnlocke2342

German translation & proofreading: GeorgeKaplan1959, deho

Polish translation: Feallan

Spanish translation: Vali

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I can't know for sure if these users are available and able to help again, but I suppose it can't hurt to provide a reminder that they've helped out in the past. Reply to this post or PM me if I can help more!

Best of luck!