How to load theme textdomain from plugin?

Question

I built a simple localization plugin to suit some specifications needed by my orgnanization. For each language there is a single .mo file that contains both the theme translations as the page content translations. The .mo files are located in myplugin/languages/en_US.mo. I'm trying to use these .mo files for all gettext calls however I cannot get them to work.

Here is the code I'm using to load the text domain:

echo get_locale(); // es_ES
$directory = dirname(plugin_basename(__FILE__)) . '/lang/';
load_plugin_textdomain('localization-v', false, $directory); 
_e("English");

Answer 1

You are completely loading your language file wrong in your plugin, and your file naming is also wrong.

load_theme_textdomain('my_plugin', plugin_dir_path( __FILE__ ) . '/languages');

should be

load_plugin_textdomain('my_plugin', false, dirname(plugin_basename(__FILE__)) . '/lang/');

Also, your mo and po files should be named my_plugin-en_US.mo and my_plugin-en_US.po. Go have a look at this tutorial also, this will help you out a lot.