Feature: #63040 - Add RTE configuration property buttons.abbreviation.removeFieldsets 

See forge#63040

Description 

The new property buttons.abbreviation.removeFieldsets may be used in Page TSconfig to configure the abbreviation dialogue.

If set, the listed fieldsets of the Abbreviation dialogue are not shown.

Possible values in the list are: acronym, definedAcronym, abbreviation, definedAbbreviation

Impact 

The acronym tag is deprecated in HTML5. Installations that want to use the Abbreviation feature of the RTE, but do not wish to use the acronym setting tab of the Abbreviation dialogue, may set this property in the Page TSconfig of the RTE, specifying buttons.abbreviation.removeFieldsets = acronym,definedAcronym