Improve monthly report template

wiki/src/blueprint/monthly_report.mdwn

@@ -173,12 +173,12 @@ Template
          This page is continuously updated by tails-press@boum.org, so if
          it's empty there might be nothing special to report.
 
-    Translation
-    ===========
+    Translations
+    ============
 
-    XXX: Add the output of `contribute/l10n_tricks/language_statistics.sh`
     XXX: Add the output of (adjust month!):
 
+        sudo apt-get install intltool
         git checkout $(git rev-list -n 1 --before="September 1" origin/master) && \
         git submodule update --init && \
         ./wiki/src/contribute/l10n_tricks/language_statistics.sh