Appdata related patches

[ghost]

appdata: Update appdata

• Add vcs-browser and translate URLs
• Mark developer name as untranslatable
• Mark release descriptions as untranslatable

appdata: Remove none OARS tags

"The old generator also included all the none-value entries—it no longer does this, you can safely remove them.

If it only consists of none values, it’s safe to shorten it to just: <content_rating type="oars-1.1" />"

More information: https://docs.flathub.org/docs/for-app-authors/appdata-guidelines/#oars-information

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[ghost]

@amka Mostly quick fixes for appdata.