The previous value was 5000, we are bumping it to 8000. This is rather 
arbitrary number based on a similar change done in LibreOffice by Eike 
Rathke.

According to the Eike's commit:

Due to an insane amount of ridiculous "user-defined" number formats the
internal table may overflow during import, stave off and increase the
number of available slots to another arbitrary limit.