During spell checking, words added to the user dictionaries still
weren't recognized by Calc, Impress and Draw because of the unnecessary
conversion their typographic apostrophes to ASCII apostrophes.
Note: Writer has no such problem because of its (obsolete) apostrophe
conversion for the user dictionary.
First skip the obsolete apostrophe conversion in isValid(), but keep
it as a fallback for Writer users.
Change-Id: I09870a35d7a91017281ba4b228d338336e7bd9c1
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/168858
Tested-by: Jenkins
Reviewed-by: László Németh <nemeth@numbertext.org>
8de1941fe6