Use more pretty output in ResourceLoader debug mode for arrays

Effected:
- mw.language.data
- mw.language.names
- mw.config.set
- mw.user.options.set for defaults
- mw.toolbar

Change-Id: I8a9e718ab15f0b3f80e12b817295c6843a570d46
Merge "Use more pretty output in ResourceLoader debug mode for arrays"