Set locales for all domains when enabling multilingual

Set locales for all domains when enabling multilingual

In the process of trying to test a possible wordpress regression I found that enabling
mutlilingual on a domain other than domain 1 breaks the site. The reason is that without
only domain 1 is being updated with the new language and locales. Since I'm on domain
2 when I do this I can no longer load any page as the locales value has not been set
and the queries look for option_value.label not option_value.label_us.

Since 'no locale' is no longer valid the locale needs to be set on all sites. Note the
code change is primarily an extraction inn order to only run the table update part once