Improved base strings to avoid duplicates

Should not affect already translated strings.

plinth/modules/networks/forms.py

@@ -132,7 +132,7 @@ class AddWifiForm(forms.Form):
     """Form to create a new Wi-Fi connection."""
     name = forms.CharField(label=_('Connection Name'))
     interface = forms.ChoiceField(
-        label=_('Physical interface'),
+        label=_('Physical Interface'),
         choices=(),
         help_text=_('The network device that this connection should be bound '
                     'to.'))

plinth/modules/transmission/templates/transmission.html

@@ -23,7 +23,7 @@
 
 {% block content %}
 
-  <h2>{% trans "Bittorrent (Transmission)" %}</h2>
+  <h2>{% trans "BitTorrent (Transmission)" %}</h2>
 
   <p>
     {% blocktrans trimmed %}