Lyndon Brown authored Mar 23, 2019 and Jean-Baptiste Kempf committed May 12, 2021

where identical to shorttext, or near enough.

bad because:
 - wastes resources.
 - useless tooltips in prefs GUI (poor UX) - tooltip longtext should add
   something of value.
 - useless repetition of text in certain help output.

in some cases they differed only in full-stop, creating unnecessary extra
burden on translators.