Refactor tooltip labels to remove default text for localization

app/views/customer_appointments/_tooltip.html.erb

@@ -18,21 +18,21 @@
 
   <% if appointment.customer %>
     <tr>
-      <th><%= l(:label_customer, default: "Customer") %></th>
+      <th><%= l(:label_customer) %></th>
       <td><%= link_to appointment.customer.name, appointment.customer %></td>
     </tr>
   <% end %>
 
   <% if appointment.vehicle %>
     <tr>
-      <th><%= l(:label_vehicle, default: "Vehicle") %></th>
+      <th><%= l(:label_vehicle) %></th>
       <td><%= link_to appointment.vehicle.name, appointment.vehicle %></td>
     </tr>
   <% end %>
 
   <% if appointment.user %>
     <tr>
-      <th><%= l(:label_technician, default: "Technician") %></th>
+      <th><%= l(:label_technician) %></th>
       <td>
         <%= avatar(appointment.user, size: 16) %>
         <%= link_to appointment.user %>
@@ -49,7 +49,7 @@
 
   <% if appointment.estimate %>
     <tr>
-      <th><%= l(:label_estimate, default: "Estimate") %></th>
+      <th><%= l(:label_estimate) %></th>
       <td>
         <%= link_to "##{appointment.estimate.id}",
                     appointment.estimate %>
@@ -94,7 +94,7 @@
 <hr>
 
 <p class="buttons">
-  <%= link_to l(:label_open_appointment, default: "Open Appointment"),
+  <%= link_to l(:label_open_appointment),
               customer_appointment_path(appointment),
               class: "icon icon-edit" %>
 </p>