Kashiv

This plugin allows to have admin panel in different language (for example, admin’s native language) from blog’s home language. This is useful when you have blog in e.g. german but you want to have admin panel in english.
This plugin works simply. It adds a “Language” form element in user profile.
It works in Dashboard as well as on the blog’s homepage.

Admin Language

This plugin allows to have admin panel in different language (for example, admin's native language) from blog's home language.

julienvdg

hreflang Flag plugin uses <a href="http://www.w3.org/TR/css3-selectors/#attribute-selectors" title="W3C CSS3 Attribute selectors description" rel="nofollow ugc">css3 selectors</a> to add a flag icon to your links depending on their <a href="http://www.w3.org/TR/html401/struct/links.html#adef-hreflang" title="hreflang attribute description on W3C" rel="nofollow ugc">hreflang attribute</a>.
This is really useful if you regularly link to pages in other languages and you want to inform your visitors about the language of the link target.
It’s even more useful if your own blog is multilingual.

hreflang Flag

Add a flag icon to link corresponding to the hreflang attribute.

Admin Language vs hreflang Flag