crowdin: Use crowdin3

* crowdin3 requires changes to the config files:
  - yaml won't work anymore due to an error:
    "Number of aliases for non-scalar nodes exceeds the specified max=50"
  - %original_path% is currently broken, so we don't use it
  - "api_token" instead of "api_key" and
    "project_id" instead of "project_identifier"
* The script itself requires a few other changes:
  - Parse stdout for the actual extracted files so we can work with those,
    that way we don't have to "guess" the downloaded files
  - Add a little spinner to indicate that there is still stuff happening
  - Rename a few variables so debugging will be easier next time...
* The script now also deletes empty folders when it removes the last
  file without translations

Change-Id: Iada741cfa3276675b23ea3cbe1bd57f6e81f108f
15 files changed
tree: 46fd7ff188b0d70ca23cecb18680da0c8ae64528
  1. config/
  2. crowdin_sync.py
  3. README.mkdn
  4. requirements.txt