Fix text overflow in Spanish translation and some translation improvements

[jorgesumle]

There were many issues with overflowing text (text was usually too long) in the Spanish translation, so I fixed some of them. However, I don't know the code, so I ask if you can solve the following ones:

I've also corrected ordinals (following Fundéu's recommendations "En español no se recomienda emplear las formas 1ro, 2do, 3ro, 4to…, que son un calco de las usadas en inglés") and months names (in Spanish they are lower-case).

[lennyhans]

About the points

• Habilidad could be just Nivel shorter and related to Skill
• Matando/Batallando Frythan simply Frythan

[the3dfxdude]

UI enhancements will happen as we can do it. Please feel free to send further abbreviations that are commonly understood by native readers.