QUESTION i18n_merge

[smdp-1971]

I'm working on a small plugin with a multi-language interface.
The problem is that the selected language is not displayed immediately (content), but after the second click on submit.
Actually, I use the same way as in the admin settings to change the language.

I use this function:

PHP Code:

$xml = getXML(dpeventGSECCONTENT);
$language = $xml->lang_settings;
i18n_merge('dp_event', $language) || i18n_merge('dp_event', 'en_US');