Compatibility with the WPML API
The WordPress multilingual plugin WPML has been created far before Falang and thus some plugins and themes have been written to play nicely with it.
Falang start to support the WPML API to avoid double work for themes and plugins author.
icl_register_string / wpml_register_single_string
Since Falang 1.1
Allows plugins to add their own strings in the “strings translation” panel. Unlike pll_register_string, icl_register_string stores the string in the database (as the WPML original function does).
icl_unregister_string
Since Falang 1.1
Removes a string from the database
icl_t / wpml_translate_single_string
Since Falang 1.1
get the translated string