Correctly parse system load on locales with "," as decimal point
On my RPi with German locale the output of `uptime` looks like this: ` 12:56:38 up 4 days, 15:35, 3 users, load average: 0,24, 0,24, 0,16` Default implementation cuts off the decimal point during parsing, resulting in very low CPU load accuracy being reported. Fix is a single character. Corrected version works both on German and English locales.
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