doc/howto_release.txt: fix URL of Transifex dashboard

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@73765 15284696-431f-4ddb-bdfa-cd5b030d7da7

doc/howto_release.txt

@@ -23,7 +23,7 @@ Contents
 # fix typos in source code with 
 tools/fix_typos.sh
 
-# i18N: sync from Transifex (https://www.transifex.com/grass-gis/grass72/dashboard/)
+# i18N: sync from Transifex (https://www.transifex.com/grass-gis/grass7/dashboard/)
 #  - except for Latvian; Latvian is directly edited in SVN and then sync'ed from trunk .po files
 cd locale
 sh ~/software/grass-addons/tools/transifex_merge.sh