Add meta charset in head

The HTTP Content-Type header has precedence but adding a meta charset in the head helps when opening an offline (e.g. downloaded) file in the browser.

Also, note that the official character set name is in uppercase.
See: http://www.iana.org/assignments/character-sets/character-sets.xhtml
Little help for Vagrant has more than 3 services
Closes #441: Cleared up some string examples.
Double v Single = meh.
Fix 'faster' typo
Merge pull request #435 from GeertDD/patch-1

Add meta charset in head
Merge pull request #438 from rogeriopradoj/patch-1

Little help for Vagrant has more than 3 services now
Cant spell basic words
Merge pull request #442 from bcrowe/faster-typo

Fix 'faster' typo
Update translation