This is a built-in template used for replace string literal expression (e.g. String s = "Hello";) with internationalized Java code expression, e.g. String s = myResourceBundle.getString("hello");.
The template is editable. Along with Java expressions and comments, you can also use the predefined variables that will be then expanded into the corresponding values.
Predefined variables will take the following values:
${RESOURCE_BUNDLE}   Expression of type java.util.ResourceBundle, instance of which is available in this context
${PROPERTY_KEY}   Property key name which is specified in the corresponding properties file. Typically it is the value that is used for ResourceBundle.getString() method parameter.
${PROPERTY_VALUE}   Property value which is specified in the corresponding properties file. This is an original Java string literal value.