SAK-40724 - Legacy translations cleanup (#6081)
* Move the es_MX language pack to sakaicontrib
* de language pack moved to contrib
* pl_PL language pack moved to contrib
* it language pack moved to contrib
* fr_CA language pack moved to contrib
* nl language pack moved to contrib
* ar language pack moved to contrib
* ru language pack moved to contrib
* pt_PT and ko languages pack moved to contrib
* zh_TW language pack moved to contrib
* vi language pack moved to contrib
* en_GB language pack moved to contrib
* Update the locale config information
* Update README.md file
* Update README.md