Bka ds locale

ds/locale: introduce

Introduces translations support.

Documentation: https://git.digitalstrom.org/brano/dss-mainline/commit/8e1acb1cb17c6e569ad54c07f0635856eaf8c736#832bcac11b3c4bbeb997ca166cb58a919ef6d76c_0_13

Example in unit tests: https://git.digitalstrom.org/brano/dss-mainline/commit/8e1acb1cb17c6e569ad54c07f0635856eaf8c736?expanded=1#af508a17ca313e22fe3565c39281aef135bbf0aa_0_170

#18767

Depends on: dss-oe/dss-oe!650 (merged)