Bug 1577 - update INSTALL to mention need to translate templates

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>

INSTALL

@@ -1,4 +1,4 @@
-Koha 3.2 - the next-generation release of the award-winning Koha open-source
+Koha 3 - the next-generation release of the award-winning Koha open-source
 integrated library system.
 
 Koha is the first open-source Integrated Library System. Developed initially in
@@ -30,6 +30,11 @@ Default installation instructions:
   as of this release date, we suggest downloading the CGI::Session::serialize::yaml
   tarball direct from CPAN and install it directly rather than using the cpan command
 
+  1.2. Optional foreign language installation:
+  If you would like more languages and not only English,
+    cd misc/translator
+    perl translate install fr-FR # or use your preferred language codes
+
 2. make
 3.(optional) make test 
 4. sudo make install