I got this fatal error: Call to undefined function json_decode() in /sites/all/modules/translation_management/google_translations/google_translations.module on line 118.
Nowhere I could find a warning about the required version: (according to php.net: PHP 5 >= 5.2.0, PECL json >= 1.2.0).
Please add this to the (non-existing) readme, the install or the report status.