There are two methods for translating the time period strings, like yearly, monthly, weekly, etc.
1. There is a Spanish translation file included with the plugin. Setting your site’s language to Spanish should automatically use the Spanish translation file. Failing that, you can create your own .mo file for the language you want based on the included .po file.
2. Add a filter callback function to run on the rmc_localization
filter. This will allow you to modify all the remaining strings to your liking. Here’s some example code to get you started – copy and paste into your theme’s functions.php.
function custom_rmc_localization( $strings ) {
// Modify strings in the array
$strings['yearly'] = 'anual';
$strings['monthly'] = 'mensual';
return $strings;
}
add_filter('rmc_localization', 'custom_rmc_localization');