New locale: sv_FI

Hello! I’d like to have new localeLocale Locale = language version, often a combination of a language code and a region code, for instance es_MX denotes Spanish as it’s used in Mexico. A list of all locales supported by WordPress in files for the language code sv_FI, meaning Swedish language in country Finland. 99% of it is the same as in sv_SE. Can we somehow automate that all untranslated stringsString A string is a translatable part of the software. A translation consists of a multitude of localized strings. in sv_FI were inherited from sv_SE or maybe that sv_FI in some other way would always fallback to sv_SE?