menu-spec: Fix translation of some categories

The msgctxt for the subcategories of 'Development Tools' was
wrong, causing the translations to not be picked up.

https://bugzilla.gnome.org/show_bug.cgi?id=729355
Don't show _Pending in the header

The label is not labeling a control, but is just freestanding
status information. As such, it doesn't benefit from a mnemonic,
and use-underline is not set to TRUE anyway.
Fix the formatting specifiers for the i386 build with newer GCCs

Apparently the new GCC is really anal about format specifiers now.
trivial: Sync the example spec file with downstream
app folders: Select newly created folders

This is the expected behavior.
https://bugzilla.gnome.org/show_bug.cgi?id=726972
Release version 3.12.2