[1pt] Add Tarantool Translation Guidelines

[art-dr]

Product: Tarantool
Audience/target: localization team
Root document: https://www.tarantool.io/en/doc/latest/contributing/docs/localization/

Details

@patiencedaur has summed up general guidelines for the localization team:
https://docs.google.com/document/d/1lf1y6bBucNOchko0sw86n6lpAPgSmEiTnwNzBgN591o/edit#
We need to add them to the doc repository.