better messages, fix typos

Author: fmichonneau

_includes/life_cycle.html

@@ -37,31 +37,35 @@
 - transition-step-1 (`transition_url` variable needed): we indicate that there
 is a new version of the lesson that is available for testing, and that it will be deprecated in the future.
 - transition-step-2 (`transition_url` and `transition_date` variables needed): we indicate that a new version of the lesson is avaiable with a deprecation date.
-- transition-step-3 (`transition_url` variable needed): the lesson if fully deprecated, and a redirect is set up to the new URL
+- transition-step-3 (`transition_url` variable needed): the lesson is fully deprecated, and a redirect is set up to the new URL
 {% endcomment %}
 
 {% elsif site.life_cycle == "transition-step-1" %}
 {% include check_transition_variables.html need_transition_date = 'false' %}
 
 <div class="alert alert-warning life-cycle">
-  A newer version of this lesson is being tested:
+  A newer version of this lesson is being tested on The Carpentries Workbench:
   <a href="{{ site.transition_url }}">{{ site.transition_url }}</a>.
-  This lesson will become deprecated in the near future.
+  The Jekyll version of this lesson will become deprecated in the near future.
 </div>
 
 {% elsif site.life_cycle == "transition-step-2" %}
 {% include check_transition_variables.html need_transition_date = 'true' %}
 
 <div class="alert alert-danger life-cycle">
-  A newer version of this lesson is available from: <a href="{{ site.transition_url }}">{{ site.transition_url }}</a>.
-  This lesson will become deprecated on {{ site.transition_date }}.
+  A newer version of this lesson is available from:
+  <a href="{{ site.transition_url }}">{{ site.transition_url }}</a>.
+  The Jekyll version of this lesson will become deprecated on
+  {{ site.transition_date }}.
 </div>
 
 {% elsif site.life_cycle == "transition-step-3" %}
 {% include check_transition_variables.html need_transition_date = 'false' %}
 
 <div class="alert alert-danger life-cycle">
-    This lesson is deprecated. A newer version is available from: <a href="{{ site.transition_url }}">{{ site.transition_url }}</a>.
+  You are veiwing a deprecated version of this lesson. An updated version is
+  available from:
+  <a href="{{ site.transition_url }}">{{ site.transition_url }}</a>.
 </div>
 
 {% endif %}