Combine a couple very similar translation strings

plus a whitespace fix

bookwyrm/templates/user/create_shelf_form.html

@@ -2,7 +2,7 @@
 {% load i18n %}
 
 {% block header %}
-{% trans "Create New Shelf" %}
+{% trans "Create Shelf" %}
 {% endblock %}
 
 {% block form %}
@@ -19,7 +19,7 @@
             {% include 'snippets/privacy_select.html' %}
         </div>
         <div class="control">
-            <button class="button is-primary" type="submit">{% trans "Create shelf" %}</button>
+            <button class="button is-primary" type="submit">{% trans "Create Shelf" %}</button>
         </div>
     </div>
 </form>

bookwyrm/templates/user/edit_shelf_form.html

@@ -29,4 +29,3 @@
 </form>
 {% endblock %}
 
-

bookwyrm/templates/user/lists.html

@@ -14,7 +14,7 @@
     </div>
     {% if is_self %}
     <div class="column is-narrow">
-        {% trans "Create new list" as button_text %}
+        {% trans "Create list" as button_text %}
         {% include 'snippets/toggle/open_button.html' with controls_text="create-list" icon="plus" text=button_text %}
     </div>
     {% endif %}