Incorrect KM translation for "Document Type"

[arky]

@Huyeng reports that the translated string "Document Type" was incorrected translated "ប្រភេទនៃច្បាប់" which mean "Type of law" in English in OpenDevelopmentMekong/ckanext-odm_library#75

wpckan/i18n/wpckan-km.po

Lines 776 to 777 in bdc10d2

	msgid "Document type"
	msgstr "ប្រភេទនៃឯកសារ"