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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Translation update in Korean

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Fix CodeSniffer violations for PHP files

Fix violations for Squiz.Commenting.DocCommentAlignment.SpaceBeforeTag

Conflicts:
inc/parser/xhtml.php

Fix grammar in proxy_except description

Remove trailing preposition.

Fix grammar for allowdebug description

Add a full stop between sentences for the allowdebug description.

Fix grammar for the hidepages description

Fix CodeSniffer violations for PHP files

Fix violations for Generic.PHP.LowerCaseConstant.Found

Fix CodeSniffer violations

Change indentation to ensure code confirms to CodeSniffer rules.

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Fix CodeSniffer violations

Remove whitespace from end of lines to reduce the number of CodeSniffer
violations.

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