Release process: clarify when (and why) to update our bundled packages.

It would really be sad to ignore the translation work done between the RC and
the final release, after we've specifically asked translators to do it
at RC time.

wiki/src/contribute/release_process.mdwn

@@ -176,11 +176,18 @@ The patterns+settings file is stored as a SQLite text dump in
 Upgrade bundled binary Debian packages
 --------------------------------------
 
-Skip this section unless we are at freeze time for a major release
-(i.e. we are about to prepare a release candidate).
-
-That is: make sure the bundled binary Debian packages contain
-up-to-date localization files.
+Skip this section if you are preparing a point-release.
+
+The goal here is to make sure the bundled binary Debian packages contain
+up-to-date localization files, so:
+
+ - If you are preparing a release candidate, build at least the packages
+   that change user-visible strings, so that translators can use the RC
+   to check the status of their work and identify what's left to do.
+ - If you are preparing a major release, build at least the packages
+   that got translation updates since the RC: we've sent a call for
+   translation while releasing the RC so the least we can do is to
+   incorporate the work that ensued into our final release :)
 
 For each bundled Debian package, `cd` into the package's root
 directory (e.g. a checkout of the `whisperback` repository),