Move some translations to their generic language code

For our Czech, Polish, and Russian translations, they do not need to be at
the more specific 'lang_COUNTRY' code, but can live at just plain 'lang'.
This follows the pattern of most other translated programs out there as
Roman pointed out on IRC.

ru_RU: 2 (pacman and libalpm)
ru: 128 for him, 131 for me (everything else)

Signed-off-by: Dan McGee <dan@archlinux.org>

TRANSLATORS

@@ -12,7 +12,7 @@ your language to the mix.
 
 * indicates the last active translator.
 
-Czech (cs_CZ):
+Czech (cs):
 	* Vojtěch Gondžala <vogo@seznam.cz>
 German (de):
 	* Matthias Gorissen <matthias@archlinux.de>
@@ -30,7 +30,7 @@ Italian (it):
 	* Giovanni 'voidnull' Scafora <linuxmania@gmail.com>
 	Alessio 'mOLOk' Bolognino <themolok@gmail.com>
 	Lorenzo '^zanDarK' Masini <lorenxo86@gmail.com>
-Polish (pl_PL):
+Polish (pl):
 	* Mateusz Jędrasik <m.jedrasik@gmail.com>
 Brazilian Portuguese (pt_BR):
 	* João Felipe Santos <joao.eel@gmail.com>
@@ -38,6 +38,6 @@ Brazilian Portuguese (pt_BR):
 	Hugo Doria <hugodoria@archlinux-br.org>
 	Lincoln de Sousa <lincoln@archlinux-br.org>
 	Leandro Inácio <leandro@archlinux-br.org>
-Russian (ru_RU):
+Russian (ru):
 	Vladimir Bayrakovskiy <4rayven@gmail.com>
 

lib/libalpm/po/LINGUAS

@@ -1,11 +1,11 @@
 # Set of available languages.
-cs_CZ
+cs
 de
 en_GB
 es
 fr
 hu
 it
-pl_PL
+pl
 pt_BR
-ru_RU
+ru

po/LINGUAS

@@ -1,11 +1,11 @@
 # Set of available languages.
-cs_CZ
+cs
 de
 en_GB
 es
 fr
 hu
 it
-pl_PL
+pl
 pt_BR
-ru_RU
+ru