What it is:
Poedit is cross-platform gettext catalogs (.po files) editor. It is
built with wxWidgets toolkit and can run on any platform supported by
it (although it was only tested on Unix with GTK+ and Windows). It
aims to provide more convenient approach to editing catalogs than
launching vi and editing the file by hand.
# Features whitespaces highlighting.
# Fuzzy and untranslated records are highlighted and displayed at the
top of the list.
# Automatic compilation of .mo files (optional).
# Automatic headers update.
# References browser lets you see where and in what context is the string used.
# You can use Poedit to scan source code for translatable strings.
To know more about:
sudo apt-get install poedit