characters filter for var name

res/layout/var_edit.xml

@@ -26,7 +26,6 @@
 		<EditText a:id="@+id/var_edit_name"
 				  a:layout_width="match_parent"
 				  a:layout_height="wrap_content"
-				  a:digits="abcdefghijklmnopqrstuvwxyz1234567890"
 				  a:textSize="20dp">
 		</EditText>
 

res/values-ru/strings.xml

@@ -74,5 +74,6 @@
 	<string name="c_history_button">M</string>
 	<string name="c_history_is_empty">История пуста!</string>
 	<string name="c_app_history">История</string>
+	<string name="c_char_is_not_accepted">Символ \'%s\' не допустим в названии переменной!</string>
 
 </resources>

res/values/strings.xml

@@ -74,4 +74,5 @@
 	<string name="c_history_button">M</string>
 	<string name="c_history_is_empty">History is empty!</string>
 	<string name="c_app_history">History</string>
+	<string name="c_char_is_not_accepted">Character \'%s\' is not accepted in variable name!</string>
 </resources>