moved "Rank" attribute from language file to plugin code

added plugin "plugin_manager"
added plugin "user_manager"

pythonrewrite/plugins/user_manager/lang/en.hdf

@@ -0,0 +1,51 @@
+Name	= User Manager
+Link	= User Manager
+
+Title {
+	UserManager	= Manage users
+	AddUser	= Add new user
+	DelUser	= Remove user
+	ChangePassword	= Change password
+}
+
+Button {
+	AddUser	= Add new user
+	DelUser	= Remove
+	ChangePassword	= Change password
+}
+
+Text {
+	NewUser	= Name of the new user
+	DelUser	= User to remove
+	ChangePasswordUser	= Change user's password
+}
+
+SuccessMessage {
+	UserAdded {
+		Title	= User added
+		Text	= The new user was added successfully.
+	}
+
+	UserRemoved {
+		Title	= User removed
+		Text	= The user was removed successfully.
+	}
+
+	PasswordChanged {
+		Title	= Password changed
+		Text	= The password was changed successfully.
+	}
+}
+
+
+WarningMessage {
+	InvalidUserName	{
+		Title	= Invalid username
+		Text	= The choosen username is invalid: only letters and digits are allowed.
+	}
+
+	UserAlreadyExists {
+		Title	= User exists
+		Text	= The choosen username does already exist. Please choose another one.
+	}
+}