The message catalog is a list of translatable strings, identified by a unique key.  In an adapter module, these files are in messages/<adapter-name>/. The default strings are in messages.properties and any translations are in messages_<language>.properties where <language> is the language tag as per IETF BCP 47.  Typical names would be messages_en-US.properties, messages_fr.properties.

A number of fields in appdef.json can optionally specify a string in the message catalog by simply specifying the key rather than a fixed string.  The fields where this is possible are:

• feed definition displayName
• additional property displayName, helpText
• app definition displayName, description

An example messages.properties is below, for strings used in the various examples throughout this document.

ConnectionType.Example.DisplayName=Example
ConnectionType.Example.description=Example application server connection
FeedType.ExampleBase.DisplayName=Example BaseFeedType.ExampleSearch.DisplayName=Example Search
FeedType.Example.hideHeader.DisplayName=Hide Header
FeedType.Example.hideHeader.helpText=Hide the header pane that normally appears when using Example directly