Closes #30: Delete locale & theme concept

docs-web-common/src/main/java/com/sismics/security/IPrincipal.java

@@ -1,9 +1,8 @@
 package com.sismics.security;
 
-import org.joda.time.DateTimeZone;
-
 import java.security.Principal;
-import java.util.Locale;
+
+import org.joda.time.DateTimeZone;
 
 /**
  * Interface of principals.
@@ -25,13 +24,6 @@ public interface IPrincipal extends Principal {
      */
     public String getId();
     
-    /**
-     * Returns the locale of the principal.
-     *
-     * @return Locale of the principal
-     */
-    public Locale getLocale();
-
     /**
      * Returns the timezone of the principal.
      *