i18n for embedded tables

[fpuga]

In the embedded tables features some strings where introduced. This strings are translated by means of PluginServices.getText

The problem with this approach is that the properties are being taked from the properties file in the user plugin, so the strings in the properties file on navtableforms should be copied to the properties file of the plugin.

We should think another approach to embed the translations on the library itself. Maybe the Java API instead of the gvSIG API for i18n can be used.