how to load the language file in plugin?

Question

I'm unable to load the plugin's locale file (.mo). I did all the procedues described in the http://codex.wordpress.org/Writing_a_Plugin but its not working. If I the lang string to the wordpress default wp-content/language/de_De.mo file then its show the correct translated string. but not loading the data from my plugin folder :(

EDIT:

$plugin_dir = basename(dirname(__FILE__)) ."/lang/";
load_plugin_textdomain( 'tboy_displayTimeZone', null, $plugin_dir );

Answer 1

"All procedures" is not very descriptive. :)

Are you calling load_plugin_textdomain() function? Had you set domain in your plugin's strings?

There is also relevant section here: I18n for theme and plugin developers

Answer 2

You have to check if the plugin's unique name is described in the translation keywords terms. For example in this code:

echo = __('Word', 'your-plugin-unique-name');

The unique name is "your-plugin-unique-name". You should add this on load function:

load_plugin_textdomain( 'your-plugin-unique-name', null, $plugin_dir );

And also has it in your .MO file's name: 'your-plugin-unique-name-de_DE.mo'

It will work.