Remove deprecated warning for PHP 8.x

Fix #570 570 Translation missing
tks to @bttrx

Changed the value from 0 to -1

In PHP 8.1, preg_split handling null was deprecated. Changed null to 0

Switch using category for better performance and consistency

Allowing to set the tagcloud number

Add traslation to 404-search rendering

Add translation for 404-page title

Add translation for "Just another HTMLy user"

Add translation for "Just another HTMLy user"

replacing text with new added key values from language files (;errors - Invalid_Error)

replacing text with new added key values from language files (;errors)

replacing text with key values from language files

i18n: Page x of y.
typos.

Add conditional statement. Before PHP 7.3 it only receive string

This reverts commit 9d25d5e49d.

The `$p->video` should return the video link only, to get the video ID we can use get_video_id(); and call it from the theme.

Create the default setting on save