Upload tab captions in the Image, Link and Flash dialogs should be revised

[Anna Tomanek]

The captions of this tab look slightly untidy and are not consistent with one another. The text of the button could also benefit from a slight change.

My suggestions:

Caption for the file upload field:
is: Upload OR Send it to the Server
should be: File to be uploaded
(the same text can be used no matter what type of upload we are dealing with)

Button:
is: Send it to the Server
should be: Send to server
(the "server" should definitely NOT be capitalized)

The standard "Browse" button would also look better if it was more in-line with other CKEditor buttons but I realize styling form elements is a bit tricky.

[Garry Yao]

Feel free to update the language file with micro change.