fix issues that arise from translation check

[SanderDevisscher]

Since #266 all files are checked for issues with regionIDs, these are listed below:

Lithobates_catesbeianus.csv:

• add gemeente
• add gewest
• add filter(!is.na(provincie))

Muntiacus_reveesi_culling.csv
- [ ] add gemeente
- [ ] add gewest
- [ ] add filter(!is.na(provincie))

Ondatra_zibethicus.csv

• add gemeente
• add gewest
• add filter(!is.na(provincie))

Oxyura_jamaicensis.csv

• add gemeente
• add gewest
• add provincie

[SanderDevisscher]

Since we don't use the muntjac data yet (see inbo/alien-species-portal#29) I suggest we remove this file for now and look into using the exoten files (GS_afschotmelding_exoten & WIZ_afschotmelding_exoten) on the google drive instead.

This might entail some changes to the flow to upload this data in the backoffice.