Hints for jami in main

Warnings

• asv-category-invalid
  jami.appdata.xml - Communication
  The category name is not valid. Refer to the XDG Menu Specification for a list of valid category names.
• asv-category-invalid
  jami.appdata.xml - Productivity
  The category name is not valid. Refer to the XDG Menu Specification for a list of valid category names.
• translations-not-found
  Unable to add languages information, even though a translation tag was present in the MetaInfo file. Please check that its value is set correctly, and all locale files are placed in the right directories (e.g. /usr/share/locale/*/LC_MESSAGES/ for Gettext .mo files).