use lang code XX-XX in plugins

public_html/deployment/classes/rollout_base.class.php

@@ -36,7 +36,14 @@ class rollout_base implements iRolloutplugin{
      * file "lang_en.json" is required in the plugin dir
      * @var string
      */
-    protected $_sLang = 'en';
+    protected $_sFallbackLang = 'en-en';
+
+    /**
+     * set language; 2 letter code, i.e. "de"; default language is "en" ; a 
+     * file "lang_en.json" is required in the plugin dir
+     * @var string
+     */
+    protected $_sLang = 'en-en';
     
     /**
      * string with phase of project; one of preview|stage|live
@@ -336,7 +343,7 @@ class rollout_base implements iRolloutplugin{
      * translated texts can be done with $this->_t("your_key")
      * 
      * @see _t()
-     * @param string   $sLang  language code, i.e. "de"
+     * @param string   $sLang  language code, i.e. "de-de"
      * @return boolean
      */
     public function setLang($sLang=false){
@@ -344,6 +351,10 @@ class rollout_base implements iRolloutplugin{
         
         $oReflection=new ReflectionClass($this);
         $sFile=dirname($oReflection->getFileName()) . '/lang_'.$this->_sLang.'.json';
+        if (!file_exists($sFile)){
+            $sFile=dirname($oReflection->getFileName()) . '/lang_'.$this->_sFallbackLang.'.json';
+            $this->_sLang=$this->_sFallbackLang;
+        }
         $this->_aLang=(file_exists($sFile)) ? json_decode(file_get_contents($sFile), 1) : $this->_aLang;
         return true;
     }