Recognise 'Lang' and 'Lange' as a prefix in streetname

[emacgillavry]

The suffix 'Lange' (= long) should be treated just like 'Korte' (= short), but is currently also classified as an Area/Locality:

• Lange Koestraat, Utrecht
• Lange Hezelstraat, Nijmegen
• Lang Grachtje, Maastricht

[emacgillavry]

"Lange" as part of the street name is however recognised as a locality/area. This classification is a result of the WhosOnFirstClassifier which derives "Lang" and "Lange" from the file name:eng_x_preferred.txt:

• "Lang" at line 21113
• "Lange" at line 85140
• "Langé" at line 138724

Ignoring these lines in a newly added file name:nld_x_preferred.txt like this:

lang
!lange
langé

does not work.

Looking for suggestions how to proceed @orangejulius @missinglink