Show button to start new translation always

Show it even if the user does not have permission, as that still gives
indication that the option is there (especially for not authenticated
users).

Fixes #1950

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/templates/component.html

@@ -110,9 +110,13 @@
 {% include "list-translations.html" %}
 <p>{% include "legend.html" %}</p>
 
-{% if object.can_add_language and user_can_add_translation %}
+{% if object.can_add_language %}
 <p>
+{% if user_can_add_translation %}
 <a class="btn btn-default" href="{% url "new-language" project=object.project.slug component=object.slug %}">{% trans "Start new translation" %}</a>
+{% else %}
+<button disabled="disabled" class="btn btn-default text-tooltip" title="{% if user.is_authenticated %}{% trans "You don't have permission to start new translation" %}{% else %}{% trans "Please login to start new translation "%}{% endif %}">{% trans "Start new translation" %}</button>
+{% endif %}
 </p>
 {% endif %}