EL is pervasive in JSF, except in one obvious place, message bundles. Adding
this support would be natural for the developer, and in some respects increase
DRY (by not requiring parameters to specified in each place the message is used).
Support the use of EL in the values of the key-value pairs present in any bundle
that is loaded via <f:loadBundle /> or via the <message-bundle> element in
faces-config.xml. The EL expression should be parsed out of the value String,
and evaluated as a value expression.