add option to show album years in grid views

ui/theme/theme.go

@@ -26,6 +26,9 @@ const (
 	ColorNameIconButton        fyne.ThemeColorName = "IconButton"
 	ColorNameHoveredIconButton fyne.ThemeColorName = "HoveredIconButton"
 	ColorNameNowPlayingPanel   fyne.ThemeColorName = "NowPlayingPanel"
+
+	SizeNameSubText    fyne.ThemeSizeName = "subText"    // in between Text and Caption
+	SizeNameSuffixText fyne.ThemeSizeName = "suffixText" // a tiny bit smaller than subText
 )
 
 var (
@@ -243,6 +246,11 @@ func (m *MyTheme) Font(style fyne.TextStyle) fyne.Resource {
 }
 
 func (m *MyTheme) Size(name fyne.ThemeSizeName) float32 {
+	if name == SizeNameSubText {
+		return 13
+	} else if name == SizeNameSuffixText {
+		return 12
+	}
 	return theme.DefaultTheme().Size(name)
 }