Small grammar correction

Here's explanation why this is the correct way:
https://english.stackexchange.com/questions/222316/are-you-sure-to-delete-or-are-you-sure-you-want-to-delete
Also `Are you sure you want to` could be found in 4 other messages in this same file.

Close #5848
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Sergey Semushin 2019-06-27 20:24:51 +03:00 committed by Don HO
parent e50236f559
commit dbc9d79df6
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@ -1012,7 +1012,7 @@ Continue?"/>
<DeleteFileFailed title="Delete File" message="Delete File failed"/>
<NbFileToOpenImportantWarning title="Amount of files to open is too large" message="$INT_REPLACE$ files are about to be opened.
Are you sure to open them?"/>
Are you sure you want to open them?"/>
<SettingsOnCloudError title="Settings on Cloud" message="It seems the path of settings on cloud is set on a read only drive,
or on a folder needed privilege right for writing access.
Your settings on cloud will be canceled. Please reset a coherent value via Preference dialog."/>