Detect table headers that contain newlines

ExtractConstants.lua

@@ -98,7 +98,7 @@ local function findRowIndexes(t)
 	local nameIndex, valueIndex, descriptionIndex
 
 	for cellIndex, cell in ipairs(headers.cells) do
-		local text = util.wikiToPlainString(cell.content)
+		local text = util.wikiToPlainString(cell.content):gsub('\n', ' ')
 
 		if nameHeaders[text] then
 			nameIndex = cellIndex