Minamp 1.5: Galician interface

- Interface in Galician by default regardless of the phone's language, with
  English selectable under Axustes -> Idioma; switching rebuilds the screens
- All text in tools/strings.py (key -> English, Galician), generating
  res/values/strings.xml (gl) and res/values-en/strings.xml; layouts now use
  string resources
- util/Tr.java: translations for the network and Plex layers, which can't
  read Android resources (falls back to English in desktop tests)
- net/RefusedException: distinguish "server answered but refused" from
  connection failures
- The connection log stays in English for troubleshooting

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/com/minamp/plex/Library.java

@@ -147,7 +147,7 @@ public final class Library {
             t.bitrate = full.bitrate; t.partSize = full.partSize;
             if (t.duration == 0) t.duration = full.duration;
         }
-        if (t.partKey.length() == 0) throw new IOException("Track has no playable media");
+        if (t.partKey.length() == 0) throw new IOException(com.minamp.util.Tr.t("no_media", "Track has no playable media"));
     }
 
     public static void shuffle(List<Item> l) {