Use ->cleanUser everywhere in usermanager. Fixes FS#2849
Some auth backend have bad cleaning, but that is responsibility of these.

Move strings to language files. Fix lang key

Improve PHPDocs and set visibility explicitly

Use zero when getUserCount is unsupported. Fixes FS#2353

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Replace tabs with spaces

Replace tabs with spaces to fixed the
Generic.WhiteSpace.DisallowTabIndent.TabsUsed sniff.

Fix CodeSniffer whitespace violoations

Removed extraneous whitespace to eliminate errors reported by the
Squiz.WhiteSpace.SuperfluousWhitespace sniff.

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Fix CodeSniffer violations for PHP files

Fix violations for Squiz.Commenting.DocCommentAlignment.SpaceBeforeTag

Conflicts:
inc/parser/xhtml.php

Fix CodeSniffer violations

Change indentation to ensure code confirms to CodeSniffer rules.

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