[FIX] elearning: fix invisible kanban view label

In the the kanban view of slide.channel, text belong numbers
was invisible (white on white) on the community version.
We change the class to be visible for each version.

TASK-ID : 2049115

closes odoo/odoo#35858

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/website_slides/views/slide_channel_views.xml

@@ -266,19 +266,19 @@
                                         <div class="col-4 border-right">
                                             <a name="action_view_slides" type="object" class="d-flex flex-column align-items-center">
                                                 <span class="font-weight-bold"><field name="total_slides"/></span>
-                                                <span class="text-secondary">Contents</span>
+                                                <span class="text-muted">Contents</span>
                                             </a>
                                         </div>
                                         <div class="col-4 border-right">
                                             <a name="action_redirect_to_members" type="object" class="d-flex flex-column align-items-center">
                                                 <span class="font-weight-bold"><field name="members_count"/></span>
-                                                <span class="text-secondary">Attendees</span>
+                                                <span class="text-muted">Attendees</span>
                                             </a>
                                         </div>
                                         <div class="col-4">
                                             <a name="action_redirect_to_done_members" type="object" class="d-flex flex-column align-items-center">
                                                 <span class="font-weight-bold"><field name="members_done_count"/></span>
-                                                <span name="done_members_count_label" class="text-secondary">Finished</span>
+                                                <span name="done_members_count_label" class="text-muted">Finished</span>
                                             </a>
                                         </div>
                                     </div>

addons/website_slides_survey/views/slide_channel_views.xml

@@ -30,8 +30,8 @@
                 <field name="nbr_certification"/>
             </xpath>
             <xpath expr="//span[@name='done_members_count_label']" position="replace">
-                <t t-if="record.nbr_certification.raw_value"><span class="text-secondary">Certified</span></t>
-                <t t-else=""><span class="text-secondary">Finished</span></t>
+                <t t-if="record.nbr_certification.raw_value"><span class="text-muted">Certified</span></t>
+                <t t-else=""><span class="text-muted">Finished</span></t>
             </xpath>
         </field>
     </record>