diff --git a/cms/templates/certificate_page.html b/cms/templates/certificate_page.html
old mode 100755
new mode 100644
index 1f6fd6943e..14e2317289
--- a/cms/templates/certificate_page.html
+++ b/cms/templates/certificate_page.html
@@ -21,39 +21,39 @@
 
 {% block content %}
 <div class="container-fluid certificate-page">
-    {% if certificate_user == user %}
-        <div class="row no-print">
-            <div class="col px-0">
-                <div class="cer-user-info">
-                    <div class="user-info-holder">
-                        <ul class="social-links">
-                        <li>
-                            <a href="https://twitter.com/intent/tweet?url={{ request.build_absolute_uri|urlencode }}&text={{ share_text|urlencode }}">
-                                <img src="{% static 'images/certificates/icon-twitter.svg' %}" alt="Share to Twitter">
-                            </a>
-                        </li>
-                        <li>
-                            <a href="http://www.facebook.com/share.php?u={{ request.build_absolute_uri|urlencode }}" target="_blank">
-                                <img src="{% static 'images/certificates/icon-facebook.svg' %}" alt="Share to Facebook">
-                            </a>
-                        </li>
-                        <li>
-                            <a href="https://www.linkedin.com/profile/add?startTask={{ page.product_name|urlencode }}" target="_blank">
-                                <img src="{% static 'images/certificates/icon-linkedin.svg' %}" alt="Share to LinkedIn">
-                            </a>
-                        </li>
-                        <li>
-                            <a href="javascript:window.print();">
-                                <img src="{% static 'images/certificates/icon-print.svg' %}" alt="Print">
-                            </a>
-                        </li>
-                    </ul>
-                        <h2>Congratulations, {{ learner_name }}!</h2>
-                        <p>You have successfully completed {{ page.product_name }}. Share your accomplishment with your friends, family and colleagues. </p>
-                    </div>
-                </div>
-            </div>
-        </div>
+    {% if certificate_user == user %}	
+        <div class="row no-print">	
+            <div class="col px-0">	
+                <div class="cer-user-info">	
+                    <div class="user-info-holder">	
+                        <ul class="social-links">	
+                        <li>	
+                            <a href="https://twitter.com/intent/tweet?url={{ request.build_absolute_uri|urlencode }}&text={{ share_text|urlencode }}">	
+                                <img src="{% static 'images/certificates/icon-twitter.svg' %}" alt="Share to Twitter">	
+                            </a>	
+                        </li>	
+                        <li>	
+                            <a href="http://www.facebook.com/share.php?u={{ request.build_absolute_uri|urlencode }}" target="_blank">	
+                                <img src="{% static 'images/certificates/icon-facebook.svg' %}" alt="Share to Facebook">	
+                            </a>	
+                        </li>	
+                        <li>	
+                            <a href="https://www.linkedin.com/profile/add?startTask={{ page.product_name|urlencode }}" target="_blank">	
+                                <img src="{% static 'images/certificates/icon-linkedin.svg' %}" alt="Share to LinkedIn">	
+                            </a>	
+                        </li>	
+                        <li>	
+                            <a href="javascript:window.print();">	
+                                <img src="{% static 'images/certificates/icon-print.svg' %}" alt="Print">	
+                            </a>	
+                        </li>	
+                    </ul>	
+                        <h2>Congratulations, {{ learner_name }}!</h2>	
+                        <p>You have successfully completed {{ page.product_name }}. Share your accomplishment with your friends, family and colleagues. </p>	
+                    </div>	
+                </div>	
+            </div>	
+        </div>	
     {% endif %}
     <div class="row">
         <div class="col certificate-wrapper">
@@ -125,8 +125,8 @@ <h2>Congratulations, {{ learner_name }}!</h2>
 
 {% block scripts %}
     {{ block.super }}
-    {% if certificate_user == user %}
-        <script type="text/javascript" async src="https://platform.twitter.com/widgets.js"></script>
+    {% if certificate_user == user %}	
+        <script type="text/javascript" async src="https://platform.twitter.com/widgets.js"></script>	
     {% endif %}
 {% endblock %}
 
diff --git a/cms/templatetags/wagtail_image_lazy_load.py b/cms/templatetags/wagtail_image_lazy_load.py
index b6039e5844..b0bb524f4b 100644
--- a/cms/templatetags/wagtail_image_lazy_load.py
+++ b/cms/templatetags/wagtail_image_lazy_load.py
@@ -11,7 +11,7 @@
 register = template.Library()
 
 
-class LazyImageNodeCustom(LazyImageNode):
+class CustomLazyImageNode(LazyImageNode):
     """
     An extention to Wagtail-lazyimages library's wagtail_lazyimages.templatetags.lazyimages_tags.LazyImageNode
     class for customizations
@@ -22,7 +22,8 @@ def render(self, context):
         This method overrides LazyImageNode's render method to add file-hashes to image urls for better caching
 
         Returns:
-            str or None: An image tag with required src and data-src attribute values
+            str or None: An image tag with required src (having tiny blurry placeholder image) and
+                data-src (having full-scale image) attribute values
         """
         img = self.image_expr.resolve(context)
         if not img:
@@ -41,23 +42,23 @@ def render(self, context):
 @register.tag(name="wagtail_image_lazy_load")
 def wagtail_image_lazy_load(img, filter_spec):
     """
-    Generates a lazy loadable image tag using Wagtail-lazyimages library and appends a version to the path to enable effective caching
+    Generates an image tag using Wagtail-lazyimages library and appends a version to the path to enable effective caching
 
     This method is inspired by wagtail_lazyimages.templatetags.lazyimages_tags.lazy_image of Wagtail-lazyimages library
 
     Args:
-        img (wagtail.images.models.Image): The image the a URL will be generated for
+        img (wagtail.images.models.Image): The image for which an image template tag will be generated
         filter_spec (str): A filter specification for the image (see Wagtail docs)
 
     Returns:
-        LazyImageNodeCustom object or None/empty str: A complete lazy loading image tag
+        CustomLazyImageNode object or None/empty str: A complete lazy loading image tag
     """
 
     if not img:
         return ""
 
     node = image(img, filter_spec)
-    return LazyImageNodeCustom(
+    return CustomLazyImageNode(
         node.image_expr,
         node.filter_spec,
         attrs=node.attrs,