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>

res/layout/activity_search.xml

@@ -13,7 +13,7 @@
         <ImageButton android:id="@+id/btn_back" style="@style/IconButton" />
         <EditText android:id="@+id/search_box" style="@style/Edit"
             android:layout_width="0dp" android:layout_weight="1"
-            android:hint="Artists, albums, tracks"
+            android:hint="@string/search_hint"
             android:imeOptions="actionSearch"
             android:inputType="text" />
     </LinearLayout>