update string translation

templates/default/activity/event/torrent/star/add.html.twig

@@ -4,7 +4,7 @@
             <img class="border-radius-50 border-color-default vertical-align-middle" src="{{ user.identicon }}" alt="{{ 'identicon' | trans }}" />
         </a>
         <span class="margin-x-4-px">
-        {{ 'added star to torrent' | trans }}
+        {{ 'added star for torrent' | trans }}
         </span>
         <a href="{{ path('torrent_info', { torrentId : torrent.id }) }}">
             {{ torrent.name }}

templates/default/activity/event/user/star/add.html.twig

@@ -4,7 +4,7 @@
             <img class="border-radius-50 border-color-default vertical-align-middle" src="{{ user.identicon }}" alt="{{ 'identicon' | trans }}" />
         </a>
         <span class="margin-x-4-px">
-        {{ 'added star to' | trans }}
+        {{ 'added star for' | trans }}
         </span>
         <a href="{{ path('user_info', { userId : by.user.id }) }}">
             <img class="border-radius-50 border-color-default vertical-align-middle" src="{{ by.user.identicon }}" alt="{{ 'identicon' | trans }}" />