Add tooltips for header icons

src/strings/en-us.json

@@ -1553,6 +1553,7 @@
     "OnApplicationStartup": "On application startup",
     "UnsupportedPlayback": "Jellyfin cannot decrypt content protected by DRM but all content will be attempted regardless, including protected titles. Some files may appear completely black due to encryption or other unsupported features, such as interactive titles.",
     "EnableBlurhash": "Enable blurred placeholders for images",
-    "EnableBlurhashHelp": "Images that are still being loaded will be displayed with a blurred placeholder"
-
+    "EnableBlurhashHelp": "Images that are still being loaded will be displayed with a blurred placeholder",
+    "ButtonSyncPlay": "SyncPlay",
+    "ButtonCast": "Cast"
 }

src/strings/es.json

@@ -1560,5 +1560,7 @@
     "EnableDetailsBannerHelp": "Mostrar imagen de banner en el tope de la página de detalles del elemento.",
     "EnableDetailsBanner": "Barra de Detalles",
     "ShowMore": "Mostrar más",
-    "ShowLess": "Mostrar menos"
+    "ShowLess": "Mostrar menos",
+    "ButtonSyncPlay": "SyncPlay",
+    "ButtonCast": "Enviar"
 }