Replace link with button in devise shared links

Cf. conversation https://github.com/consuldemocracy/consuldemocracy/pull/5955#discussion_r2158715957
Need to get this i18n_spec.rb to run to delete the key
shared.links.signin_with_provider.

app/views/devise/shared/_links.html.erb

@@ -11,10 +11,4 @@
     <%= link_to t("devise_views.shared.links.new_unlock"), new_unlock_path(resource_name) %><br>
   <% end -%>
 
-  <%- if devise_mapping.omniauthable? && devise_mapping.name == "user" %>
-    <%- resource_class.omniauth_providers.each do |provider| %>
-      <%= link_to t("devise_views.shared.links.signin_with_provider", provider: provider.to_s.titleize), omniauth_authorize_path(resource_name, provider), method: :post %><br>
-    <% end -%>
-  <% end -%>
-
 </div>

config/locales/en/devise_views.yml

@@ -69,7 +69,6 @@ en:
         new_confirmation: Haven't received instructions to activate your account?
         new_password: Forgotten your password?
         new_unlock: Haven't received unlocking instructions?
-        signin_with_provider: Sign in with %{provider}
         signup: Don't have an account? %{signup_link}
         signup_link: Sign up
     unlocks:

config/locales/es/devise_views.yml

@@ -69,7 +69,6 @@ es:
         new_confirmation: '¿No has recibido instrucciones para confirmar tu cuenta?'
         new_password: '¿Olvidaste tu contraseña?'
         new_unlock: '¿No has recibido instrucciones para desbloquear?'
-        signin_with_provider: Entrar con %{provider}
         signup: '¿No tienes una cuenta? %{signup_link}'
         signup_link: Regístrate
     unlocks: