Adds API to enable translations to be set and specific API for flags

[tastybento]

This was a request on Discord so that plugins can set flags and set the name and lore for them too.

The translations can be set after building the flag. I did not add the option to set translations to the flag builder (yet) because setting translations may require some logic to discover what locales are supported on the server, and then iterate through them assigning the appropriate translation.

Example to set the name and description for a flag:

if (Flag.MY_CUSTOM_FLAG.setTranslatedName(Locale.US, "Custom Flag")
    && Flag.MY_CUSTOM_FLAG.setTranslatedDescription(Locale.US, "A Custom Flag")) {
    // Success
} else {
   /// Failure - because the locale is not supported on the server
}

Example to set a reference via API generically:

BentoBox.getInstance().getLocalesManager().setTranslation(Locale.US, "a.reference.here", "A translation");

Setting translations via API is not permanent, i.e., translations are not stored in the locale files and the files are not changed. So, they can be temporarily overwritten, but not fundamentally changed.

The fallback locale for any reference is Locale.US so that should be set at a minimum.

[sonarcloud]

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