How about a language selector for custom sidebars?

I see you have just about all the bases covered for choosing when and where to place a sidebar, except I do not see any way to set a sidebar depending upon the language being displayed.

There is a great plugin for multi-language websites at http://wpml.org and they actually go out of their way to make it easy for plugin developers to add support.

In this case, you would have 2 functions to use. One function will get a list of all the languages used on the website, and the second function will get the current language being displayed.

Having those 2 functions mean you can easily add in a language selector to the sidebar plugin and then have full support for multilingual websites.

Their functions:
1: icl_get_languages() is a function that will return an array of the active languages

Array
(
[en] => Array
(
[id] => 1
[active] => 1
[encode_url] => 0
[native_name] => English
[language_code] => en
[translated_name] => English
[url] => http://siteurl/
[country_flag_url] => http://siteurl/wp-content/plugins/sitepress-multilingual-cms/res/flags/en.png
) [de] => Array
(
[id] => 3
[active] => 0
[encode_url] => 0
[native_name] => Deutsch
[language_code] => de
[translated_name] => German
[url] => http://siteurl/de/
[country_flag_url] => http://siteurl/wp-content/plugins/sitepress-multilingual-cms/res/flags/de.png
)
[el] => Array
(
[id] => 13
[active] => 0
[encode_url] => 0
[native_name] => Ελληνικα
[language_code] => el
[translated_name] => Greek
[url] => http://siteurl/el/
[country_flag_url] => http://siteurl/wp-content/plugins/sitepress-multilingual-cms/res/flags/el.png
)
)

#2
if (ICL_LANGUAGE_CODE=='en')
…….

We are then able to use if/then statements because of the ability of the function above.

So there you have it, the 2 needed functions to VERY EASILY add in another tab of custom language choices to work perfectly with the wpml plugin.

If you are interested in adding in the support I would love to send a copy of wpml to you and work with you on this project as I kind of need it myself and I am not quite sure where to plug this into your plugin.

http://wordpress.org/extend/plugins/custom-sidebars/