I would like to work on this task

Hi, that's perfect!

First of all, fork Huggle repository - it's on github http://github.com/huggle/huggle3-qt-lx

Once you have it forked on your github profile, then you can use git to create a new branch and upload it to your fork. There is git preinstalled, so all you need to do is open a terminal (it's in side bar) and navigate to huggle repository (use these commands):

# better safe than sorry
cp -r ~/Documents/huggle3-qt-lx ~/Documents/backup
cd ~/Documents/huggle3-qt-lx
# Now this will open editor
gedit .git/config

In text editor, replace this part of text

[remote "origin"]
    url = https://github.com/huggle/huggle3-qt-lx

With this:

[remote "origin"]
    url = https://github.com/<your username>/huggle3-qt-lx

Where obviously username is yours ;)

Then execute these commands:

# set up git first
# Change these values
git config --global user.name "Your username"
git config --global user.email "your@email"
git checkout -b T164775
# if you know how to use git, just add all files you changed, otherwise do:
git commit -a -m "T164775: implemented language dialog in welcome screen"
git push origin T164775

That should send the branch to your fork of huggle's repo, then if you open it on GitHub, you should see "send a pull request" button, just press it, and I will be notified about the pull request, let me know if you had troubles.