The keyword 'requires' is no longer shown as keyword

The parsing is done by Scalariform. Because it treats 'requires' still as a keyword,
it needs to be translated to default content type.

Fix #1000750
Reformatting of ScalariformToSyntaxClass
Merge pull request #313 from sschaef/issue/backport-requires-keyword

[backport] Issue/backport requires keyword