Firstly welcome

Secondly I have some remarks to oln and Stefans suggestions:
oln {l Wrote}:- Implement sound effects more places
To make the sound effects work properly with the game (be in sync and at the right volume) we would need a editor (in the map editor) that can playback mesh/model animations and then the user can specify which frames where sounds should start, and at which volume. Right now we have some sound effects, but they are all pretty much out of sync or have a unnoticeable volume, that would be a very needed tool for doing proper sound work. Also you will be working both with graphics and sound at the same time, but it will probably also be challenging for at starting job.
I would not recommend this as refactoring requires intimate knowledge about the code-base, it would be better to get to know the code base first, else you might end up doing refactoring that would go against the current ideas in the code base. I would suggest implementing something new and pretty small, as a start.
oln {l Wrote}:- Storage of config/screenshots etc. in home folder. (Not sure if this is finished or not.)
There should not be much to do code-wise here. It is the installers responsibility to tell the game where to store this stuff, so the game should just read a path out of a config file and then read and write stuff to that path. I will let you know when I get this working in the windows installer. For linux we need a guy who knows how to make deb-packages, both in general and for this task.
StefanP.MUC {l Wrote}:- I implemeted a GUI class (GUI.h/cpp) and a Translation class (Translation.h/cpp) that is a wrapper around tinygettext (gettext alternative). They basically work (tested it), but they are still not used to do the translation. This maybe, maybe not needs some looking into CEGUI (our GUI framwork), depending on how deep you would hack into it.
The translation should be the right startup job. It is pretty new in the code base, and should be pretty simple to do, unless CEGUI will cause trouble. So starting here would be the best in my opinion.