Use language tags in labels and comments

Affects: SAREF and its extensions

Situation: this is a best practice, and translations in other languages may be provided in the future

Proposal: To use language tags @en instead of the xsd:string datatype for all labels and comments.

Status: agreed during SmartM2M-RG Meeting about 2 NWIs SAREFv3 and SAREF Com Framework V2 2019-04-08

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