Small fixes.

wiki/src/contribute/how/translate.mdwn

@@ -17,10 +17,10 @@ already available in Tails.
 
 ## Custom programs
 
-Tails comes with several [[custom programs|custom_programs]] which need
+Tails comes with several [[custom programs]] which need
 translation.
 
-You can find the PO files for each program via gitweb:
+For each program, you can find the PO files, to be used by [[!wikipedia gettext]], via gitweb:
 
   - [[!tails_devel_gitweb_dir config/chroot_local-includes/usr/share/locale]]
   - [Tails Greeter](http://git.immerda.ch/?p=tails/tails-greeter.git;a=tree;f=po;hb=HEAD)