Add get /api/sources/{sourceIdentifier} to be able to get a source by id.

[ianwallen]

Add get /api/sources/{sourceIdentifier} to be able to get a source by id.

Moved /api/sources/{type} to Moved /api/sources?type=type as it conflicted with /api/sources/{sourceIdentifier}

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• I have read the contribution guidelines
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[josegar74]

Tested, works fine.

The UI has been updated with the API change. @fxprunayre just to confirm if you know users who use this API in third party applications, as they would need to update their applications.