Improvements for new players!

As time passes and more people play, more bugs appear and I receive more feedback. Due to criticism to lack of clarity about the elements, I've made a small update that makes it just a little bit clearer to evade confussion:

• Removed sound effect when firing with no abilities unlocked
• Removed mana usage when firing with no abilities unlocked
• Added warn when firing with no abilities unlocked
• Added warn when changing element with no abilities unlocked

I've also fixed a small typo in the english translation:

• Fixed small typo in english translation, now the map should show 'You' instead of 'str_you'