fixed strict violation in ACL plugin

Fix issues from teams:i18n:translation-check in localizations

translation update

allow charset for SSO to be configured FS#2148

translation update

translation update

replace \s, \S with [ \t], [^ \t] in regexs used with acls

translation update

translation update

translation update

translation update

remove obsolete opera handling and session closing

remove no longer used ajax.php

Info plugin: allow xhtml renders to not to be an xhtml renderer

Renderers that set the format to xhtml don't necessarily inherit from
Doku_Renderer_xhtml, this reverts a prior change that introduced

Info plugin: allow xhtml renders to not to be an xhtml renderer

Renderers that set the format to xhtml don't necessarily inherit from
Doku_Renderer_xhtml, this reverts a prior change that introduced the
stricter parameter type.

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comment improvements

translation update

replace boolean conditional checks on possibly uninitialized vars with \!empty/empty/isset as appropriate

translation update

fix signature mail unittest, and improve some signatures info plugin

fix expression passed by reference

fix signatures and old by references

fix php strict notices

compact some CSS styles to their shorthand syntax FS#2509

Fix PHP strict messages

Put syntax modes in a table layout, sort numbers in rowspans. Implements FS#2516