Spoken ordinal numbers not extracted correctly (in German)

[JoergZ2]

>>> a = "nimm den siebten eintrag"
>>> b = ovos_number_parser.extract_number_de(a)
>>> b
>>> 

Maybe not all grammatical variants are considered...

Further examples (using strings from module source code):

>>> a = "nimm den siebt eintrag"
>>> b = ovos_number_parser.extract_number_de(a)
>>> print(b)
>>> None

In English a bit different, may help:

>>> a = "take second row"
>>> b = ovos_number_parser.extract_number_en(a)
>>> print(b)
>>> False

Noticeable that in German it is 'None' and in English 'False'