Make a few translation errors translateable - thx hugok79 :)

Work on #6492

LanguageBaseEnglish.xml

@@ -1781,6 +1781,11 @@ Download and continue?</VideoFromUrlRequirements>
     <UsingOnlyFrontCenterChannel>Using only front center audio channel</UsingOnlyFrontCenterChannel>
     <BeforeConvertingColorsToDialog>Before converting colors to dialog</BeforeConvertingColorsToDialog>
     <ConvertedColorsToDialog>Converted colors to dialog</ConvertedColorsToDialog>
+    <PleaseInstallVideoPlayer>Please install video player</PleaseInstallVideoPlayer>
+    <UnableToPlayMediaFile>SE was unable to play the video/audio file (or file is not a valid video/audio file).</UnableToPlayMediaFile>
+    <SubtitleEditNeedsVideoPlayer>Subtitle Edit needs a video player.</SubtitleEditNeedsVideoPlayer>
+    <UseRecommendMpv>To use the recommended video player "mpv" click on the button below.</UseRecommendMpv>
+    <DownloadAndUseMpv>Download and use "mpv" as video player</DownloadAndUseMpv>
   </Main>
   <MatroskaSubtitleChooser>
     <Title>Choose subtitle from Matroska file</Title>

src/ui/Forms/VideoError.cs

@@ -18,20 +18,22 @@ namespace Nikse.SubtitleEdit.Forms
             InitializeComponent();
             UiUtil.FixFonts(this);
             UiUtil.FixLargeFonts(this, buttonCancel);
+
+            buttonMpvSettings.Text = LanguageSettings.Current.Main.DownloadAndUseMpv;
         }
 
         public void Initialize(string fileName)
         {
             Text += fileName;
             var sb = new StringBuilder();
-            sb.Append("SE was unable to play the video/audio file (or file is not a valid video/audio file).");
+            sb.Append(LanguageSettings.Current.Main.UnableToPlayMediaFile);
 
             var currentVideoPlayer = Configuration.Settings.General.VideoPlayer;
             if (string.IsNullOrEmpty(currentVideoPlayer))
             {
-                Text = "Please install video player";
+                Text = LanguageSettings.Current.Main.PleaseInstallVideoPlayer;
                 sb.Clear();
-                sb.Append("Subtitle Edit needs a video player.");
+                sb.Append(LanguageSettings.Current.Main.SubtitleEditNeedsVideoPlayer);
                 currentVideoPlayer = "DirectShow";
             }
 
@@ -49,7 +51,7 @@ namespace Nikse.SubtitleEdit.Forms
             if (Configuration.IsRunningOnLinux)
             {
                 sb.AppendLine();
-                sb.AppendLine("Try installing latest version of libmpv and libvlc!");
+                sb.AppendLine("Try installing latest version of libmpv or libvlc!");
                 sb.Append("Read more about Subtitle Edit on Linux here: https://nikse.dk/SubtitleEdit/Help#linux");
             }
             else if (currentVideoPlayer == "MPV" && Configuration.IsRunningOnWindows)
@@ -69,7 +71,7 @@ namespace Nikse.SubtitleEdit.Forms
             }
             else if (currentVideoPlayer != "MPV")
             {
-                labelMpvInfo.Text = "To use the recommended video player \"mpv\" click on the button below.";
+                labelMpvInfo.Text = LanguageSettings.Current.Main.UseRecommendMpv;
                 if (isLibMpvInstalled)
                 {
                     buttonMpvSettings.Text = "Use \"mpv\" as video player";

src/ui/Logic/Language.cs

@@ -1681,7 +1681,11 @@ namespace Nikse.SubtitleEdit.Logic
                 UsingOnlyFrontCenterChannel = "Using only front center audio channel",
                 BeforeConvertingColorsToDialog = "Before converting colors to dialog",
                 ConvertedColorsToDialog = "Converted colors to dialog",
-
+                PleaseInstallVideoPlayer = "Please install video player",
+                UnableToPlayMediaFile = "SE was unable to play the video/audio file (or file is not a valid video/audio file).",
+                SubtitleEditNeedsVideoPlayer = "Subtitle Edit needs a video player.",
+                UseRecommendMpv = "To use the recommended video player \"mpv\" click on the button below.",
+                DownloadAndUseMpv = "Download and use \"mpv\" as video player",
 
                 Menu = new LanguageStructure.Main.MainMenu
                 {

src/ui/Logic/LanguageDeserializer.cs

@@ -3880,6 +3880,21 @@ namespace Nikse.SubtitleEdit.Logic
                 case "Main/ConvertedColorsToDialog":
                     language.Main.ConvertedColorsToDialog = reader.Value;
                     break;
+                case "Main/PleaseInstallVideoPlayer":
+                    language.Main.PleaseInstallVideoPlayer = reader.Value;
+                    break;
+                case "Main/UnableToPlayMediaFile":
+                    language.Main.UnableToPlayMediaFile = reader.Value;
+                    break;
+                case "Main/SubtitleEditNeedsVideoPlayer":
+                    language.Main.SubtitleEditNeedsVideoPlayer = reader.Value;
+                    break;
+                case "Main/UseRecommendMpv":
+                    language.Main.UseRecommendMpv = reader.Value;
+                    break;
+                case "Main/DownloadAndUseMpv":
+                    language.Main.DownloadAndUseMpv = reader.Value;
+                    break;
                 case "Main/Menu/File/Title":
                     language.Main.Menu.File.Title = reader.Value;
                     break;

src/ui/Logic/LanguageStructure.cs

@@ -1533,6 +1533,11 @@ namespace Nikse.SubtitleEdit.Logic
             public string UsingOnlyFrontCenterChannel { get; set; }
             public string BeforeConvertingColorsToDialog { get; set; }
             public string ConvertedColorsToDialog { get; set; }
+            public string PleaseInstallVideoPlayer { get; set; }
+            public string UnableToPlayMediaFile { get; set; }
+            public string SubtitleEditNeedsVideoPlayer { get; set; }
+            public string UseRecommendMpv { get; set; }
+            public string DownloadAndUseMpv { get; set; }
 
             public class MainMenu
             {