web cert template rendering - adjust signature image sizing

cms/static/js/certificates/views/signatory_editor.js

@@ -172,7 +172,7 @@ function ($, _, Backbone, gettext,
             event.preventDefault();
             var upload = new FileUploadModel({
                 title: gettext("Upload signature image."),
-                message: gettext("Image must be 450px X 150px transparent PNG."),
+                message: gettext("Image must be in PNG format."),
                 mimeTypes: ['image/png']
             });
             var self = this;

cms/static/sass/views/_certificates.scss

@@ -532,6 +532,10 @@
       .signatory-image {
         margin-top: 20px;
       }
+
+      .signature-image {
+        max-width: 450px;
+      }
     }
 
     .signatory-panel-body label {

cms/templates/js/signatory-editor.underscore

@@ -41,7 +41,7 @@
                 <div class="signature-upload-wrapper">
                   <div class="signature-upload-input-wrapper">
                     <input id="signatory-signature-<%= signatory_number %>" class="collection-name-input input-text signatory-signature-input" name="signatory-signature-url" type="text" placeholder="<%= gettext("Path to Signature Image") %>" value="<%= signature_image_path %>"  aria-describedby="signatory-signature-<%= signatory_number %>-tip" readonly />
-                    <span id="signatory-signature-<%= signatory_number %>-tip" class="tip tip-stacked"><%= gettext("Image must be 450px X 150px transparent PNG") %></span>
+                    <span id="signatory-signature-<%= signatory_number %>-tip" class="tip tip-stacked"><%= gettext("Image must be in PNG format") %></span>
                   </div>
                   <button type="button" class="action action-upload-signature">Upload Signature Image</button>
                 </div>