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Describe the bug

Using variables fails when text property contains more than just the variable

To Reproduce

{"page":0,"obj":"label","id":110,"x":410,"y":3,"w":390,"h":40,"text":"%hostname%"}

returns "plate6"

{"page":0,"obj":"label","id":110,"x":410,"y":3,"w":390,"h":40,"text":"%hostname% (%ip%)"}

returns "%hostname% (%ip%)"

Expected behavior

I would expect that all variable names are replaced by the current values, so that
"%hostname% (%ip%)"
becomes
"plate6 (192.168.X.X)"