Further tweaks to text and text formatting

This commit has some further changes to text throughout the application. There are also some small fixes for text formatting. E.g. making sure that the small "helper" text under certain form fields is all consistent in terms of colour, font, etc.

application/models/Timeplotter_model.php

@@ -143,7 +143,7 @@ class Timeplotter_model extends CI_Model
         }
         else {
             header('Content-Type: application/json');
-            $data['error'] = 'No qsoes to plot found!';
+            $data['error'] = 'No QSOs found to plot!';
             echo json_encode($data);
         }