conditionnally install appdata files

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
silence clang warnings

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
Update German translations
update THANKS

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
libgpaste-core: improve growing lines

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
update NEWS

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
info is already in plural
Some formulation and spelling issues

Conflicts:
	README.md
Merge branch 'gpaste-3.10'

* gpaste-3.10:
  Some formulation and spelling issues
  info is already in plural
  update NEWS
  libgpaste-core: improve growing lines
  update THANKS
  Update German translations
  silence clang warnings
  conditionnally install appdata files