Improve text strings

TNL-4018

openassessment/templates/openassessmentblock/grade/oa_grade_complete.html

@@ -184,7 +184,7 @@
 
                                         <ul class="list list--actions submission__feedback__actions">
                                             <li class="list--actions__item">
-                                                <button type="submit" class="action action--submit feedback__submit">{% trans "Submit Feedback on Peer Assessments" %}</button>
+                                                <button type="submit" class="action action--submit feedback__submit">{% trans "Submit feedback on peer assessments" %}</button>
                                             </li>
                                         </ul>
                                     </div>

openassessment/templates/openassessmentblock/response/oa_response.html

@@ -99,7 +99,7 @@
 
                         <ul class="list list--actions">
                             <li class="list--actions__item">
-                                <button type="submit" id="submission__save" class="action action--save submission__save is--disabled">{% trans "Save Your Progress" %}</button>
+                                <button type="submit" id="submission__save" class="action action--save submission__save is--disabled">{% trans "Save your progress" %}</button>
 
                                 <div id="response__save_status" class="response__submission__status">
                                     <h3 class="response__submission__status__title">

openassessment/templates/openassessmentblock/self/oa_self_assessment.html

@@ -64,7 +64,7 @@
                 <ul class="list list--actions">
                     <li class="list--actions__item">
                         <button type="submit" id="self-assessment--001__assessment__submit" class="action action--submit is--disabled">
-                            <span class="copy">{% trans "Submit Your Assessment" %}</span>
+                            <span class="copy">{% trans "Submit your assessment" %}</span>
                         </button>
                     </li>
                 </ul>

openassessment/xblock/peer_assessment_mixin.py

@@ -199,15 +199,15 @@ class PeerAssessmentMixin(object):
 
             if continue_grading:
                 context_dict["submit_button_text"] = self._(
-                    "Submit your assessment & review another response"
+                    "Submit your assessment and review another response"
                 )
             elif assessment["must_grade"] - count == 1:
                 context_dict["submit_button_text"] = self._(
-                    "Submit your assessment & move onto next step"
+                    "Submit your assessment and move to next step"
                 )
             else:
                 context_dict["submit_button_text"] = self._(
-                    "Submit your assessment & move to response #{response_number}"
+                    "Submit your assessment and move to response #{response_number}"
                 ).format(response_number=(count + 2))
 
         if workflow_status == "cancelled":