Rubocop offense fixes

[flaccid]

In various templates, fix:

• C: Use 2 spaces for indentation in an array, relative to the start of the line where the left bracket is.
• C: Extra empty line detected at block body beginning.
• C: %-literals should be delimited by ( and )
• C: C: Use %r only for regular expressions matching more than 1 '/' character.
• C: Extra empty line detected at block body end.

[flaccid]

@paulczar bump :)