If we have an unused images page the bot adds an old style [[:<other language>:<other page>]] interwiki link. These days the pages are linked using Wikidata so this is no longer needed.
Some fun people at the Dutch Wikipedia decided to enforce no interwiki with an abusefilter rule so now the bot is completely broken. Great
```
ERROR: editpage: abusefilter-warning-interwiki
Hit AbuseFilter: Toevoegen interwikilink,
WARNING: Page [[Wikipedia:Wikiproject/Erfgoed/Belgische Erfgoed Inventarisatie/Vlaanderen/Ongebruikte foto's]] not saved
Traceback (most recent call last):
File "/data/project/heritage/pywikibot/pwb.py", line 246, in <module>
if not main():
File "/data/project/heritage/pywikibot/pwb.py", line 240, in main
run_python_file(filename, [filename] + args, argvu, file_package)
File "/data/project/heritage/pywikibot/pwb.py", line 87, in run_python_file
main_mod.__dict__)
File "unused_monument_images.py", line 243, in <module>
main()
File "unused_monument_images.py", line 238, in main
countrycode, lang, countryconfig, conn, cursor, conn2, cursor2)
File "unused_monument_images.py", line 124, in processCountry
page.put(text, comment)
File "/data/project/heritage/pywikibot/pywikibot/tools/__init__.py", line 1105, in wrapper
return obj(*__args, **__kw)
File "/data/project/heritage/pywikibot/pywikibot/page.py", line 1145, in put
**kwargs)
File "/data/project/heritage/pywikibot/pywikibot/tools/__init__.py", line 1105, in wrapper
return obj(*__args, **__kw)
File "/data/project/heritage/pywikibot/pywikibot/page.py", line 1063, in save
cc=apply_cosmetic_changes, **kwargs)
File "/data/project/heritage/pywikibot/pywikibot/page.py", line 1087, in _save
raise err
pywikibot.exceptions.PageSaveRelatedError: Page [[nl:Wikipedia:Wikiproject/Erfgoed/Belgische Erfgoed Inventarisatie/Vlaanderen/Ongebruikte foto's]] was not saved.
<class 'pywikibot.exceptions.PageSaveRelatedError'>
```