Forms, image input tweaks

* Tweaked image input default styles
* Fixed image input functions
[fix] Forms, renderer

* Renderer methods accept template renderer instance as first arg
[fix] Forms, renderer - tabs

* Fixed renderer call func error
* Fixed renderer render select opts
* Widgets do not require their parts if they have action and value
* Widgets assemble tools and then use them
Forms, locales

* Added tiny portion of locales
System user

* Avatar and nick are not mandatory attrs anymore
Forms, tabs

* Fixed form tab labels
Forms, action widget

* Fixed action widget value after submit
Forms, Delete checker

* Moved delete checker function to renderer
Form text fix

* Fixed form method text