Add translation update script with transifex issue workaround (#1195)

Script will do an lupdate run on mumble_en.ts, apply the duplication
of numerus tags workaround for the transifex missing string issue
(see #1195) and then create a commit with the updated translation
file. This file - at least for now - is meant to be run manually.
Make sure to check the created commit before pushing.

scripts/updatetranslations.sh

@@ -0,0 +1,23 @@
+#! /bin/bash
+# Updates mumble_en.ts from source and adds a commit.
+# Expects to be executed in src/mumble/
+file="mumble_en.ts"
+
+if ! [ -f $file ];
+then
+    echo "Could not find $file . Aborted."
+    exit 1
+fi;
+
+echo "Translation update" > commitmessage.tmp
+echo "" >> commitmessage.tmp
+lupdate -no-ui-lines -disable-heuristic similartext -locations relative -no-obsolete mumble.pro -ts $file | tee -a commitmessage.tmp
+
+# Duplicate single numerusform entries in mumble_en.ts to work around #1195
+perl -pi.bak -e 's!(^\s*)(<numerusform></numerusform>)$!\1\2\2!' $file
+
+
+git commit -F commitmessage.tmp $file
+rm commitmessage.tmp
+
+echo "Probably done. Please _manually_ check the commit before pushing"