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Many PHPDocs, some unused and dyn declared vars

many PHPDocs
some unused variables
some dynamically declared variables declared

more scrutinizer issue improvements

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updated dates in info.txt of various plugins and template

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Move colon from code to language strings

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improvements in acl plugin to avoid missing var errors

use empty() where array values might not be set

removed empty language files

our translation interface used to submit empty files for a while but no
longer does, so these can go

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