Under Language & Input and Language there is still only a subset of the Languages available there on the GUI.
it was a ABL issue at release of GA1 but promised by Prod Mgr ED B and Andy McBain to be completed at GA2
TC75 / TC55 KK have now all Android Languages available there.
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GMS build will support additional languages
Non GMS build does not have enough memory on system partition to support additional languages currently