Latvian: add missing translations
Latvian: add missing translations

Added:
`activerecord.errors.messages.restrict_dependent_destroy`, `datetime.distance_in_words.x_years`, `errors.messages.model_invalid`, `errors.messages.other_than`, `errors.messages.present`, `errors.messages.required`

digitalfrost/rails-i18n,svenfuchs/rails-i18n