Default error handling for unknown ajax errors

[kartik-v]

New properties have been added:

• msgAjaxError has been added - this will contain a token {operation} which will be replaced by the relevant ajax operation as defined in ajaxOperations (a new property)
• msgAjaxProgressError has been added to display error title in the upload progress bar - this will contain a token {operation} which will be replaced by the relevant ajax operation as defined in ajaxOperations (a new property)
• ajaxOperations - a configuration of the labels for the various ajax operations for above, defaults to:

{
    deleteThumb: 'file delete',
    uploadThumb: 'single file upload',
    uploadBatch: 'batch file upload',
    uploadExtra: 'extra data upload'
},

[kartik-v]

Resolved via updates to release v4.3.7.