I've problem with dotproject: dysplaying a GANTT chart says that the PHP does not support my locale settingThis is a well known bug in the application you are using, and in order to fix it you have to modify the /public_html/prj/lib/jpgraph/src/jpgraph.php. This could be done from your cPanel -> File Manager :
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Navigate to the /public_html/prj/lib/jpgraph/src/ path and click on the letter next to the icon of jpgraph.php.
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A little box appears on the right top-side of the page.
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You should click on "Edit File Contents" in order to edit that file.
Please note that you must also set the locale to en_US in order for your GANTT characters to be displayed properly, as it should be by default.