Remove bold text from SVG/PNG output, switch font.

For some reason, the translation from SVG to PNG causes bold text to be
typeset incorrectly (it looks like Imagemagick doesn't know to leave
more space for bold or similar). So remove all the bold text from the
body.

www/includes/easyparliament/templates/html/mp/votes_svg.php

@@ -22,16 +22,13 @@
     $stance_padding_top = 14;
     $stance_padding_bottom = 8;
 
-    $tspan_bold_open = '<tspan font-weight="bold">';
-    $tspan_bold_close = '</tspan>';
-
     header("Content-type: image/svg+xml");
 
     echo '<?xml version="1.0" encoding="utf-8"?>';
 
  ?>
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<svg width="1000" height="500" viewBox="0 0 1000 500" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" font-family="Droid Sans, Trebuchet">
+<svg width="1000" height="500" viewBox="0 0 1000 500" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" font-family="Source Sans Pro">
 
     <rect fill="<?= $color_cream; ?>" x="0" y="0" width="1000" height="500"></rect>
 
@@ -50,7 +47,7 @@
                 if (strpos($line, '*') !== False) {
                     echo preg_replace(
                         '#(?:^|[*])([^\r\n *][^*\n]*[^\r\n *])(?:$|[*])#i',
-                        $tspan_bold_open . '$1' . $tspan_bold_close,
+                        '$1',
                         $line
                     );
                 } else {