... to look pretty; most of these expect PRODUCTEXTENSION to be a word
like "Beta" but nowadays it is ".micro.rc.alphabeta" numbers so there
should be no space before it.

ReplaceStringHookProc adds insult to injury by refusing to
replace %ABOUTBOX variables unless some %PRODUCT is in the string.

Change-Id: Ib676f3837ab0785529a226fc9359e8defacf3459
(cherry picked from commit c106167f)
Reviewed-on: https://gerrit.libreoffice.org/1763Reviewed-by: Miklos Vajna <vmiklos@suse.cz>
Tested-by: Miklos Vajna <vmiklos@suse.cz>