Shamelessly copy Listbox.py implementation, which limits acquisition usage

For compatibility, do not check local properties when the listbox uses contentValues (ListMethodWrapper).

Keeping the browser's back button usable is a requirement to keep users happy.

Also add a comment in getSearchableText to explain why

As it will get the string represenation of the dates, and not even
the date formatted given the system / user preferences. Thus it makes
no sense to fulltext search on it.

Install erp5js tests to use its macros.

Translation attributes have been removed.

Stop the test as soon as an error occurs

This prevent to load the translation gadget during the page load

Do not prevent different gadget to be loaded in parallel

Reduce number of acquire method call

Stop displaying the loader everytime jIO is called.
This clarify the loader meaning: the page is rendering.

Stop displaying the header loader during the first rendering.

Panel is already closed during bootstrap