pidgin/pidgin

Mark the protocol descriptions for translation and tweak them a bit.

Testing Done:
Compile only

Reviewed at https://reviews.imfreedom.org/r/902/
syntax: glob
.*.swp
.DS_Store
.flatpak-builder
*.pyc
*~
\#*\#
syntax: regexp
^build(.+)?\/
win32-install-dir(\.release)?
po\/pidgin\.pot$
^subprojects\/.+\/