Users trying to upload a source document from the Zanata UI on an instance that did not have locale 'en' enabled.
Zanata would reject the upload because it defaults to locale 'en' for source documents. This conflicts the maven client's default (en-US), and means that two different documents would have different outcomes when pushing from the maven client and uploading from the UI.
Furthermore, users were not able to pick a source language when uploading documents.
Enabled source locale selection when uploading a document via the UI. By default, en-US is selected if this locale is enabled on the Zanata server (to keep in line with the maven client defaults).
Users are now able to select a source locale when uploading a document, and get en-US as default when said locale is enabled.