Unable to Upload File into Assets On Turkish Localization

[manojattal]

1. Add Turkish as a new language into the site.
2. Activate the new language
3. Ensure that DNN is accessible through /tr-tr
4. Access Persona Bar >> Contents >> Assets
5. Upload a file

Unable to complete the upload process and it hang indefinitely. Browser console returns the following:

Uncaught TypeError: Cannot read property 'message' of null
at FileUploadPanel.FileUploadPanel._processResponse (dnn.FileUpload.js?cdv=114:481)
at FileUploadPanel.FileUploadPanel._done (dnn.FileUpload.js?cdv=114:473)
at HTMLInputElement.i (jquery.js?cdv=114:2)
at HTMLInputElement.dispatch (jquery.js?cdv=114:2)
at HTMLInputElement.v.handle (jquery.js?cdv=114:2)
at Object.trigger (jquery.js?cdv=114:2)
at HTMLInputElement. (jquery.js?cdv=114:2)
at Function.each (jquery.js?cdv=114:2)
at s.fn.init.each (jquery.js?cdv=114:2)
at s.fn.init.trigger (jquery.js?cdv=114:2)

I tried other localization and I could confirm that this issue is not reproducible in the followings localization:

ar-SA (Saudi Arabia)
ru-RU (Russia)
es-ES (Spain)
ms-MY (Malaysia)
fr-FR (France)

[manojattal]

I intend to work on this ticket and I can submit pull request in a day or two.