Rename 'show_site_locale_default' to 'show_option_site_default'

[SergeyBiryukov]

[39169] introduced a show_site_locale_default argument for wp_dropdown_languages(), which adds a 'Site Default' option to the user-specific language setting.

I'm not a native English speaker, but the wording of the argument name sounds confusing to me.

Any chance to rename it to show_option_site_default, for consistency with show_option_all and show_option_none arguments in wp_dropdown_categories()?

[SergeyBiryukov]

Related: #38869

[swissspidy]

Makes sense to me, thanks for pointing this out!

[ramiy]

+1

[johnjamesjacoby]

+1

[ocean90]

In 39331:

I18N: In wp_dropdown_languages() rename the new show_site_locale_default argument to show_option_site_default.

This makes it consistent with arguments of other wp_dropdown_*() functions.

Props SergeyBiryukov.
See #38632.
Fixes #38871.