Extend Transifex developer notes for label and name about `locationSet.include` countries

[tordans]

With this PR, it becomes easier for translators to skip local presets. It adds notes on local presets to the Transifex developer notes.

It is based on the field locationSet: ['de'] which exists for fields and presets. However, we only look at locationSet.includes for those notes. We skip locationSet.excludes because that would suggest that a translation is not needed, which can be wrong in cases, where the keys are reused / referenced in another preset. The translation is only done once but have multiple references with different locationSets.

Related

• https://github.com/openstreetmap/id-tagging-schema/pull/331#discussion_r779251632
• https://github.com/ideditor/schema-builder/issues/27

Closes https://github.com/ideditor/schema-builder/issues/27

[tordans]

FYI I created https://github.com/openstreetmap/id-tagging-schema/pull/825 as a follow up for this to explain how this new feature can be used.