Find out which languages you really get
Tag tickets by language for a month. Often two or three languages make up almost all of the volume.
Use translation for understanding first
Read the customer's message in your language to understand it, and reply in theirs when you are confident the translation is simple.
Keep replies plain
Short sentences and common words translate well. Avoid idioms, jokes and long conditional sentences.
Translate your most important articles
Start with setup, billing and refunds. Machine translation with a quick human check is usually enough for a start.
Know when to stop using translation
For legal, medical, money or safety topics, find a fluent person to review the reply or say clearly what you can and cannot help with.
Tell customers what to expect
If replies may take longer in some languages, say so in the auto-reply so nobody feels ignored.