These files aren't needed anymore.
We should copy it to translate.wordpress.org and remove the files once the translations are accepted.

Existing languages
Available on wp.org and removed in plugin are marked as complete
https://translate.wordpress.org/projects/wp-plugins/widget-css-classes

• nl_NL
• ru_RU
• es_ES
• pl_PL
• sk_SK
• sr_RS
• sv_SE