Import the locale file in the theme if it exists
Import the locale file in the theme if it exists

Fixes #2591

jacob-v-dam/forkcms,Katrienvh/forkcms,carakas/forkcms,forkcms/forkcms,riadvice/forkcms,jessedobbelaere/forkcms,justcarakas/forkcms,sumocoders/forkcms,Katrienvh/forkcms,carakas/forkcms,forkcms/forkcms,carakas/forkcms,carakas/forkcms,justcarakas/forkcms,jonasdekeukelaere/forkcms,justcarakas/forkcms,sumocoders/forkcms,forkcms/forkcms,jessedobbelaere/forkcms,jonasdekeukelaere/forkcms,bartdc/forkcms,forkcms/forkcms,jacob-v-dam/forkcms,sumocoders/forkcms,jessedobbelaere/forkcms,bartdc/forkcms,jessedobbelaere/forkcms,bartdc/forkcms,Katrienvh/forkcms,riadvice/forkcms,jacob-v-dam/forkcms,jacob-v-dam/forkcms,carakas/forkcms,jonasdekeukelaere/forkcms,sumocoders/forkcms,Katrienvh/forkcms,riadvice/forkcms,riadvice/forkcms,jonasdekeukelaere/forkcms,jonasdekeukelaere/forkcms,sumocoders/forkcms