I have the same problem. Whatever I put in the label field for Other, it doesn’t help. At any time “Other” is shown. This should not happen because there are 2 settings which should override it.
1. The label is set on the Settings page. This is not reflected on the production website
2. The translation file is set correctly as well. I know that the translation file is used correctly, because everything else of this plugin is translated correctly. This is the entry:
#: wc-customer-source.php:261 wc-customer-source.php:295
msgid “Other”
msgstr “Anders”
Still goes wrong somewhere…