#1 Fix for missing upload error dialog

[Richard]

I did the English and French translations myself. The Bulgarian and Japanese translations will need to be corrected. The rest of the languages were translated by Google language tools.

Suggestion. If some languages (like Portuguese) don't have a google translation for upload, consider using the work for 'send' ( French: envoyer, Portuguese: enviar)

This patch will reconfigure a duplicate lang file value: $conf['nls']['upload'] =
The new value will be: $conf['nls']['uploadbtn'] =

uploadbtn will continue to contain the text that is used for the upload button.
the text associated with the original 'upload' value is now changed to give the user a more descriptive error message.

index.php is no configured to use the indexbtn in the upload form.

[Richard]

Upload error message patch