Avoid printing dot when copyright holder already ends with dot (#666)

e.g. My Company, Inc.

Author: FrostyX

sphinx_rtd_theme/footer.html

@@ -16,9 +16,9 @@
     <p>
     {%- if show_copyright %}
       {%- if hasdoc('copyright') %}
-        {% trans path=pathto('copyright'), copyright=copyright|e %}&copy; <a href="{{ path }}">Copyright</a> {{ copyright }}.{% endtrans %}
+        {% trans path=pathto('copyright'), copyright=copyright|e %}&copy; <a href="{{ path }}">Copyright</a> {{ copyright }}{% endtrans %}
       {%- else %}
-        {% trans copyright=copyright|e %}&copy; Copyright {{ copyright }}.{% endtrans %}
+        {% trans copyright=copyright|e %}&copy; Copyright {{ copyright }}{% endtrans %}
       {%- endif %}
     {%- endif %}