Right now phrases, related to form validations errors (e.g. "Field is required", "Field value isn't unique", etc.) are scattered between Theme's and Admin's Language Packs and some of them have "la_" prefix, while others have "lu_" prefix.

This becomes a serious problem, when creating website not based on advanced theme and having it's huge language pack already imported.

I propose, that we:

  1. locate all phrases related to form validation errors
  2. rename them to start with "lc_error_"
  3. move to admin's language pack

Here are some phrases I've found: