I18n: Update translation de (100%).

203 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation de (100%).

203 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation de (100%).

203 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
Update Autotools
Don't use CXX/CPP
I18n: Update translation bg (100%).

203 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
gtk_cell_renderer_text_new is never used
Check the return value of gtk_tree_selection_get_selected
atoi (argv[2]) is unsafe

Passing argv command line arguments directly into atoi is unsafe.
Use strtol and check/sanatize what it returns.
Check the return value of select