Plugin Explorer hardcoded strings

[kubalav]

These strings are hardcoded. Make them translatable, please.

Flow.Launcher/Plugins/Flow.Launcher.Plugin.Explorer/Search/ResultManager.cs

Line 99 in d2d1c47

var subtitle = ToReadableSize(drv.AvailableFreeSpace, 2) + " free of " + ToReadableSize(drv.TotalSize, 2);

Flow.Launcher/Plugins/Flow.Launcher.Plugin.Explorer/Search/ResultManager.cs

Line 190 in d2d1c47

SubTitle = $"Use > to search within {subtitleFolderName}, " +

Flow.Launcher/Plugins/Flow.Launcher.Plugin.Explorer/Search/ResultManager.cs

Line 191 in d2d1c47

$"* to search for file extensions or >* to combine both searches.",