Quantity translation threshold

**Is your feature request related to a problem? Please describe.**
We are developing an Android App, and we are thrilled with our recent Weblate integration to manage translations, however, when a new translation language is started, and the percentage of strings translated is low, the app doesn't look right.

**Describe the solution you'd like**
A threshold that could be configured in order to meet a minimum percentage of translation before it was pushed from Weblate GIT to VCS repository. It could be per Project or per Component.

For instance, if we set minimum valid translation to 60%, no language files with less than 60% of strings translated will be pushed to our repository.

Maybe .gitignore could be used to add those files until they meet the required translation limit.

Thanks