Improve consistency in tutorial and random map texts.
- Combines multi-spaces into one.
- \u000a -> \n.
- Proper quotation marks instead of programmers quotes.
- A few typos.
- Capitalise classes.
Scenarios and skirmishes are excluded due to checkrefs.pl not being able to handle proper quotes in XML.
Patch by: @Nescio
Differential revision: D3493
Comments by: @Stan