[KevinH]

Understood.
For the record, spellchecking works with utf-8 encoded dictionaries that actually have words with apostrophes (contractions and the like) in that dictionary wordlist.

The problem with the German dictionary in question is twofold:

1. It was encoded is iso-8859-1 not utf-8 and the smart single quote/ apostrophe does not exist in that single byte encoding
2. The dictionary wordlist itself did not include any words with apostophes (single quotes) in the dictionary at all.

These are problems the dictionary owner should fix.

That said, I will see about adding support and a preference setting for numbers. But please note: not all dictionaries add mixed letter number words to their dictionary wordlist, and so perfectly valid things will then get marked as bad.

Grepping for all digits and examining them is probably a safer approach.