Add Base_viewFieldLibrary/my_core_mode_required_text_content_validator

/reviewed-on nexedi/erp5!598

/reviewed-on nexedi/erp5!597

Also, as this error is returned via reponse code 403, we don't expect the element
to be present. Hence there is no need to keep that check anymore.

Use this dialog in test to check if it correctly raises implementation error
when trying to access this dialog.

In case there is an error and the target response if of type json, we
should check for the portal_status_message and display it.

[erp5_hal_json_style]:
Do not set HTTP response code for error in Base_renderForm.
Add new script Base_returnFailureMessage to return response header for HTTP code errors.
Also, Remove useless message trunacation

Also, Alt-Space is already bound to 'just-one-space' and not needed anyway as
CodeMirror binds autocomplete to Alt-/ by default.

[erp5_only_office][erp5_officejs_ooffice] move cubefunction witch uses xmla in cubeFunctions.xmla.js file

it is couse by license conflict

/reviewed-on !593

/reviewed-on !595

See romain/erp5@bbb5d569

See bbb5d569

/reviewed-on nexedi/erp5!594

See commit 9ec2259e.

Do not silently skip content for void elements.
Do not add not requested \n which create unwanted textNode.

Display also the pagination state next to the listbox title