PSI gatherer returns #NUM! when locale is not en-us (e.g. de-de)

[jonchenn]

When the locale set to "de-de" in the PSI gatherer, the following fields return #NUM! instead of values:

psi.metrics.lighthouse.Images
psi.metrics.lighthouse.Fonts
psi.metrics.lighthouse.Javascript
psi.metrics.lighthouse.ThirdParty
psi.metrics.lighthouse.HTML