fix(db-postgres): handle localized groups/tabs or localized fields inside of them

[r1tsuu]

Description

Fixes #6029 Copying of localeRow is neccessary as we need to delete table._locale after, which could affect other localized fields transforming on the same level, but we want to do this only for our group/tab. (If you'll run test int:postgres localization it won't pass without copying)

• [x] I have read and understand the CONTRIBUTING.md document in this repository.

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

Checklist:

• [x] I have added tests that prove my fix is effective or that my feature works
• [x] Existing test suite passes locally with my changes