railway-electrification: use 'frequency=0' and 'frequency>0' for translation

railway-electrification.json

@@ -110,12 +110,12 @@
         "",
         "  <tr>",
         "    <td>{{ markerLine({ 'width': 3, 'color': color })|raw }}</td>",
-        "    <td>{{ trans('direct current') }}</td>",
+        "    <td>{{ trans('tag:frequency=0') }}</td>",
         "  </tr>",
         "",
         "  <tr>",
         "    <td>{{ markerLine({ 'styles': [ 'casing', 'default' ], 'style:casing': { 'width': 3, 'color': 'white' }, 'style': { 'width': '3', 'dashArray': '5,2', 'lineCap': 'butt', 'color': color } })|raw }}</td>",
-        "    <td>{{ trans('alternating current') }}</td>",
+        "    <td>{{ trans('tag:frequency>0') }}</td>",
         "  </tr>",
         "",
         "  <tr>",