removed old tpl_content_core method

Removed progressbar from searchform

translation update

prevent pages to be shown in trace if you don't have rights to read

small fix

prevent hidden pages to be shown in trace

Replace htmlspecialchars to hsc in core

response on review

extracted functions
added test coverage

doc abbreviation

Fix PHP Notices: Reduce error log noise

While DokuWiki suppresses PHP Notices they are still a code smell and
should be fixed. This fixes some PHP Notices that occurred.

Some of these fixes could b

Fix PHP Notices: Reduce error log noise

While DokuWiki suppresses PHP Notices they are still a code smell and
should be fixed. This fixes some PHP Notices that occurred.

Some of these fixes could be refactored into nicer code once we move to
PHP 7 and get access to the `??` operator.

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Create valid empty options

The HTML-spec[0] specifies:

> If the element has no label attribute and is not a child of a datalist element: Text that is not inter-element whitespace.

So a non-breakin

Create valid empty options

The HTML-spec[0] specifies:

> If the element has no label attribute and is not a child of a datalist element: Text that is not inter-element whitespace.

So a non-breaking space is valid solution.

[0] https://html.spec.whatwg.org/multipage/form-elements.html#the-option-element

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cleaning

fix tests on windows

doc fix

translation update

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Update html.php

$regex initialization added to clearify that it is passed by reference and filled from subroutines

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