Add searx_extra package

Split the utils directory into:
* searx_extra contains update scripts, standalone_searx.py
* utils contains the files to build and setup searx.

searx_extra/update/update_translations.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+# script to easily update translation language files
+
+# add new language:
+# pybabel init -i messages.pot -d searx/translations -l en
+
+SEARX_DIR='searx'
+
+pybabel extract -F babel.cfg -o messages.pot "$SEARX_DIR"
+for f in `ls "$SEARX_DIR"'/translations/'`; do
+    pybabel update -N -i messages.pot -d "$SEARX_DIR"'/translations/' -l "$f"
+done
+
+echo '[!] update done, edit .po files if required and run pybabel compile -d searx/translations/'