Remove TODO.rst

TODO.rst

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-gafam-poster-translations TODO
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-
-- [x] Fix Japanese translation for Google
-- [o] Use official German translations while retaining the custom one
-- [x] Provide list of languages in some kind of MANIFEST.json file.
-  Then, use this information from self.Makefile and posterkit-o-mat.examples.lqdn.chooser
-- [o] Switch to three-letter ISO 639-3 language codes
-
-    - https://en.wikipedia.org/wiki/ISO_639-3
-    - http://www-01.sil.org/iso639-3/codes.asp?letter=a
-
-- [o] Address lower casing of poster names