[POC]Add the translation string.

osu.Game.Rulesets.Karaoke/Edit/Generator/Languages/LanguageDetector.cs

@@ -7,6 +7,7 @@
 using osu.Framework.Localisation;
 using osu.Game.Rulesets.Karaoke.Edit.Generator.Types;
 using osu.Game.Rulesets.Karaoke.Objects;
+using osu.Game.Rulesets.Karaoke.Localisation.Edit.Generator;
 
 namespace osu.Game.Rulesets.Karaoke.Edit.Generator.Languages
 {
@@ -31,7 +32,7 @@ public LanguageDetector(LanguageDetectorConfig config)
         public LocalisableString? GetInvalidMessage(Lyric lyric)
         {
             if (string.IsNullOrWhiteSpace(lyric.Text))
-                return "Lyric should not be empty.";
+                return LanguageDetectorStrings.LyricShouldNotBeEmpty;
 
             return null;
         }

osu.Game.Rulesets.Karaoke/Edit/Generator/Notes/NoteGenerator.cs

@@ -8,6 +8,7 @@
 using osu.Game.Rulesets.Karaoke.Edit.Generator.Types;
 using osu.Game.Rulesets.Karaoke.Objects;
 using osu.Game.Rulesets.Karaoke.Utils;
+using osu.Game.Rulesets.Karaoke.Localisation.Edit.Generator;
 
 namespace osu.Game.Rulesets.Karaoke.Edit.Generator.Notes
 {
@@ -25,10 +26,10 @@ public NoteGenerator(NoteGeneratorConfig config)
             var timeTags = lyric.TimeTags;
 
             if (lyric.TimeTags.Count < 2)
-                return "Sorry, lyric must have at least two time-tags.";
+                return NoteGeneratorStrings.SorryLyricMustHaveAtLeastTwoTimeTags;
 
             if (timeTags.Any(x => x.Time == null))
-                return "All time-tag should have the time.";
+                return NoteGeneratorStrings.AllTimeTagShouldHaveTheTime;
 
             return null;
         }

osu.Game.Rulesets.Karaoke/Edit/Generator/RomajiTags/RomajiTagGenerator.cs

@@ -4,6 +4,7 @@
 using osu.Framework.Localisation;
 using osu.Game.Rulesets.Karaoke.Edit.Generator.Types;
 using osu.Game.Rulesets.Karaoke.Objects;
+using osu.Game.Rulesets.Karaoke.Localisation.Edit.Generator;
 
 namespace osu.Game.Rulesets.Karaoke.Edit.Generator.RomajiTags
 {
@@ -19,7 +20,7 @@ protected RomajiTagGenerator(T config)
         public LocalisableString? GetInvalidMessage(Lyric lyric)
         {
             if (string.IsNullOrWhiteSpace(lyric.Text))
-                return "Lyric should not be empty.";
+                return RomajiTagGeneratorStrings.LyricShouldNotBeEmpty;
 
             return null;
         }

osu.Game.Rulesets.Karaoke/Edit/Generator/RubyTags/RubyTagGenerator.cs

@@ -4,6 +4,7 @@
 using osu.Framework.Localisation;
 using osu.Game.Rulesets.Karaoke.Edit.Generator.Types;
 using osu.Game.Rulesets.Karaoke.Objects;
+using osu.Game.Rulesets.Karaoke.Localisation.Edit.Generator;
 
 namespace osu.Game.Rulesets.Karaoke.Edit.Generator.RubyTags
 {
@@ -19,7 +20,7 @@ protected RubyTagGenerator(T config)
         public LocalisableString? GetInvalidMessage(Lyric lyric)
         {
             if (string.IsNullOrWhiteSpace(lyric.Text))
-                return "Lyric should not be empty.";
+                return RubyTagGeneratorStrings.LyricShouldNotBeEmpty;
 
             return null;
         }

osu.Game.Rulesets.Karaoke/Edit/Generator/TimeTags/TimeTagGenerator.cs

@@ -7,6 +7,7 @@
 using osu.Framework.Localisation;
 using osu.Game.Rulesets.Karaoke.Edit.Generator.Types;
 using osu.Game.Rulesets.Karaoke.Objects;
+using osu.Game.Rulesets.Karaoke.Localisation.Edit.Generator;
 
 namespace osu.Game.Rulesets.Karaoke.Edit.Generator.TimeTags
 {
@@ -22,7 +23,7 @@ protected TimeTagGenerator(T config)
         public LocalisableString? GetInvalidMessage(Lyric lyric)
         {
             if (string.IsNullOrEmpty(lyric.Text))
-                return "Lyric should not be empty.";
+                return TimeTagGeneratorStrings.LyricShouldNotBeEmpty;
 
             return null;
         }

osu.Game.Rulesets.Karaoke/Localisation/Edit/Generator/LanguageDetectorStrings.cs

@@ -0,0 +1,16 @@
+using osu.Framework.Localisation;
+
+namespace osu.Game.Rulesets.Karaoke.Localisation.Edit.Generator
+{
+    public static class LanguageDetectorStrings
+    {
+        private const string prefix = @"osu.Game.Rulesets.Karaoke.Localisation.LanguageDetector";
+
+        /// <summary>
+        /// "Lyric should not be empty."
+        /// </summary>
+        public static LocalisableString LyricShouldNotBeEmpty => new TranslatableString(getKey(@"lyric_should_not_be_empty"), @"Lyric should not be empty.");
+
+        private static string getKey(string key) => $@"{prefix}:{key}";
+    }
+}

osu.Game.Rulesets.Karaoke/Localisation/Edit/Generator/NoteGeneratorStrings.cs

@@ -0,0 +1,21 @@
+using osu.Framework.Localisation;
+
+namespace osu.Game.Rulesets.Karaoke.Localisation.Edit.Generator
+{
+    public static class NoteGeneratorStrings
+    {
+        private const string prefix = @"osu.Game.Rulesets.Karaoke.Localisation.NoteGenerator";
+
+        /// <summary>
+        /// "Sorry, lyric must have at least two time-tags."
+        /// </summary>
+        public static LocalisableString SorryLyricMustHaveAtLeastTwoTimeTags => new TranslatableString(getKey(@"sorry_lyric_must_have_at_least_two_time_tags"), @"Sorry, lyric must have at least two time-tags.");
+
+        /// <summary>
+        /// "All time-tag should have the time."
+        /// </summary>
+        public static LocalisableString AllTimeTagShouldHaveTheTime => new TranslatableString(getKey(@"all_time_tag_should_have_the_time"), @"All time-tag should have the time.");
+
+        private static string getKey(string key) => $@"{prefix}:{key}";
+    }
+}

osu.Game.Rulesets.Karaoke/Localisation/Edit/Generator/RomajiTagGeneratorStrings.cs

@@ -0,0 +1,16 @@
+using osu.Framework.Localisation;
+
+namespace osu.Game.Rulesets.Karaoke.Localisation.Edit.Generator
+{
+    public static class RomajiTagGeneratorStrings
+    {
+        private const string prefix = @"osu.Game.Rulesets.Karaoke.Localisation.RomajiTagGenerator";
+
+        /// <summary>
+        /// "Lyric should not be empty."
+        /// </summary>
+        public static LocalisableString LyricShouldNotBeEmpty => new TranslatableString(getKey(@"lyric_should_not_be_empty"), @"Lyric should not be empty.");
+
+        private static string getKey(string key) => $@"{prefix}:{key}";
+    }
+}

osu.Game.Rulesets.Karaoke/Localisation/Edit/Generator/RubyTagGeneratorStrings.cs

@@ -0,0 +1,16 @@
+using osu.Framework.Localisation;
+
+namespace osu.Game.Rulesets.Karaoke.Localisation.Edit.Generator
+{
+    public static class RubyTagGeneratorStrings
+    {
+        private const string prefix = @"osu.Game.Rulesets.Karaoke.Localisation.RubyTagGenerator";
+
+        /// <summary>
+        /// "Lyric should not be empty."
+        /// </summary>
+        public static LocalisableString LyricShouldNotBeEmpty => new TranslatableString(getKey(@"lyric_should_not_be_empty"), @"Lyric should not be empty.");
+
+        private static string getKey(string key) => $@"{prefix}:{key}";
+    }
+}

osu.Game.Rulesets.Karaoke/Localisation/Edit/Generator/TimeTagGeneratorStrings.cs

@@ -0,0 +1,16 @@
+using osu.Framework.Localisation;
+
+namespace osu.Game.Rulesets.Karaoke.Localisation.Edit.Generator
+{
+    public static class TimeTagGeneratorStrings
+    {
+        private const string prefix = @"osu.Game.Rulesets.Karaoke.Localisation.TimeTagGenerator";
+
+        /// <summary>
+        /// "Lyric should not be empty."
+        /// </summary>
+        public static LocalisableString LyricShouldNotBeEmpty => new TranslatableString(getKey(@"lyric_should_not_be_empty"), @"Lyric should not be empty.");
+
+        private static string getKey(string key) => $@"{prefix}:{key}";
+    }
+}