loc() cleanup in missions and some scripts

[GoogleCodeExporter]

Branch name:
loc

This branch is on:
https://bitbucket.org/Wuzzy2/hedgewars-wuzzy

Purpose of code changes on this branch:
This branch cleans up most of the loc() mess throughout the missions and 
multiplayer scripts.
In detail:
- Applied loc() to strings which have been forgotten for some reason
- String concatenation was replaced by string.format, to make it more 
translator-friendly
- Copy-editing where I thought it made sense
- Replaced the chat slang found in some missions

When reviewing my code changes, please focus on:
That I have nothing broken. ;-)
The quick tests by my did not show any crashes.

Original issue reported on code.google.com by almikes@aol.com on 30 Jul 2015 at 3:35

[GoogleCodeExporter]

Don't be confused by the name “Wuzzy2” on Bitbucket. I have lost the user 
name “Wuzzy” there, so I just created a new account instead. When crediting 
me, please call me “Wuzzy” (if possible; this is just a request).

Original comment by almikes@aol.com on 30 Jul 2015 at 3:39