Breaking: #54409 - RTE "acronym" button was renamed "abbreviation"¶
See Issue #54409
The "acronym" tag being deprecated, the RTE "acronym" button was renamed "abbreviation". Accordingly, the RTE Acronym plugin was renamed Abbreviation.
There is no immediate impact on the RTE configuration in Page TSconfig and TCA special configuration options until the automatic conversion of existing references to "acronym" is removed in TYPO3 CMS 8.0. Intallations may run the upgrade wizard of the Install tool to migrate the contents of Page TSconfig, replacing "acronym" by "abbreviation". Note that this string replacement will apply to all contents of PageTSconfig. The migration of PageTSconfig may also be done manually.
User TSconfig must be modified to refer to "abbreviation" instead of "acronym".