Fix language detection when language looks like HTML
Fix language detection when language looks like HTML

The text detector would fail to detect anything if a text that looked
like invalid HTML (specifically "<" used in different meaning, without
corresponding ">") happened early in the catalog. Pass
is_plain_text=true to CLD2 to prevent this.

This makes it that CLD2 doesn't filter out HTML tags (somewhat common in
WordPress files), but homefully their amount would be insignificant and
wouldn't affect the detection's output.

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