typos needing fixing

[TallTed]

As flagged here

Creative spellings --

• defaultPreferedLangages
• getPreferredLanagugesFor

There may be others. To fix the above ---

• s/Prefered/Preferred/g
• s/Langages/Languages/g
• s/Lanaguges/Languages/g

@timbl did the first global, but not the other two.

And there is one more -- s/deafults/defaults/g

This will be much faster and easier for someone who works with command-line git and/or editors than for me, as I work entirely through the GitHub web interface.