Upstream the appdata changes

[bilelmoussaoui]

I have added a new patch recently to add the OARS tags & the releases info
We still have some warnings

• tag-missing           : <update_contact> is not present
• value-missing         : <!-- Copyright [year] [name] --> is not present
• style-invalid         : Not enough <p> tags for a good description [0/1]
• style-invalid         : <li> cannot end in '.' [Assorted bugfixes.]
• translations-required  : <name> has no translations
• translations-required  : <summary> has no translations
• translations-required  : <description> has no translations

it would be nice to properly fix them and send all of those changes upstream.

[Eonfge]

Upstream pull request: vslavik/poedit#514