Add translation capability

HACKING.md

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+Localization
+=====
+ 1) Mark all translatable strings by wrapping them in gettext() (or \_())
+ 2) Extract all those strings:
+    pybabel extract -F babel.cfg -o messages.pot .
+ 3) Update the language-specific translation files:
+    pybabel update -i messages.pot -d translations/ -l [LANGCODE]
+ 4) Translate the strings in the generated .po files using your favourite editor
+ 5) Compile the .po files to .mo files:
+	pybabel compile -d translations