getUFLocale() is not setting the proper locale
## Overview Presently, the function ```getUFLocale()``` obtains the interface language for Wordpress with integration with WPML. The present formula is using incorrect ```apply_filters``` to generate the wrong locale for front-endusers. This was discovered while working validating the pull request [#289](https://github.com/civicrm/civicrm-wordpress/pull/289) for better WPML integration for front-end users. ## What should happen The link should be generated in the language that the current user has set. ## What is the problem ```php // Maybe override with the locale that WPML reports. elseif (defined('ICL_LANGUAGE_CODE')) { $languages = apply_filters('wpml_active_languages', NULL); foreach ($languages as $language) { if ($language['active']) { $locale = $language['default_locale']; break; } } } ``` According to the docs, ```apply_filters('wpml_active_languages', NULL)``` only retrieves a list of languages, but this has no bearing on the user's current language. The value ```$language['active']``` refers to whether the language is active or not. In my case, I have seen this reported as _false_ in some cases where languages are active - go figure :shrug: . So we need to use ```apply_filters('wpml_current_language')``` [to obtain](https://wpml.org/wpml-hook/wpml_current_language/) the users front-end language. I'll post a patch for this and link it to this one. cc @kcristiano
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