save language tags in lower case to ensure consistency

[samuelstroschein]

Problem

Language tags are inconsistent across inlang apps because they are case sensitive. See https://github.com/opral/inlang-fink/issues/40.

Proopsal

Store language tags always in lower case in an inlang project.

• According to BCP47, casing is irrelevant
• Human readability of casing might be increased but the cost of enforcing case insensitivity across inlang apps is too high

[samuelstroschein]

@loris.sigrist do you think this is a good idea?

[LorisSigrist]

Yes, Paraglide already noramlizes the case for all comparisons. It would be good to have some consistency

[samuelstroschein]

cancelling. this is the job of a validation rule. if we implicitly save locales in lower case, i am sure that users will be surprised.