Remove source from Localizer

This can be obtained from the addon instance

src/main/java/ch/njol/skript/Skript.java

@@ -498,11 +498,8 @@ public void onEnable() {
 		// initialize the modern Skript instance
 		skript = org.skriptlang.skript.Skript.of(getClass(), getName());
 		unmodifiableSkript = skript.unmodifiableView();
-		skript.localizer().setSourceDirectories(
-			getClass(),
-			"lang",
-			getDataFolder().getAbsolutePath() + "lang"
-		);
+		skript.localizer().setSourceDirectories("lang",
+				getDataFolder().getAbsolutePath() + "lang");
 		// initialize the old Skript SkriptAddon instance
 		getAddonInstance();
 

src/main/java/ch/njol/skript/SkriptAddon.java

@@ -102,7 +102,7 @@ public SkriptAddon loadClasses(String basePackage, String... subPackages) throws
 	 * @return This SkriptAddon
 	 */
 	public SkriptAddon setLanguageFileDirectory(String directory) {
-		localizer().setSourceDirectories(plugin.getClass(), directory, plugin.getDataFolder().getAbsolutePath() + directory);
+		localizer().setSourceDirectories(directory, plugin.getDataFolder().getAbsolutePath() + directory);
 		return this;
 	}
 

src/main/java/ch/njol/skript/localization/Language.java

@@ -211,7 +211,7 @@ public static void loadDefault(SkriptAddon addon) {
 			return;
 		}
 
-		Class<?> source = addon.localizer().source();
+		Class<?> source = addon.source();
 		assert source != null; // getSanitizedLanguageDirectory call means source should not be null
 		try (
 			InputStream defaultIs = source.getResourceAsStream("/" + languageFileDirectory + "/default.lang");
@@ -283,8 +283,7 @@ private static boolean load(SkriptAddon addon, String name, boolean tryUpdate) {
 			return false;
 		}
 
-		Class<?> source = addon.localizer().source();
-		assert source != null; // getSanitizedLanguageDirectory call means source should not be null
+		Class<?> source = addon.source();
 
 		// Backwards addon compatibility
 		if (name.equals("english")) {

src/main/java/org/skriptlang/skript/localization/Localizer.java

@@ -29,17 +29,11 @@ static Localizer of(SkriptAddon addon) {
 	/**
 	 * Sets the language file directories for this localizer.
 	 * This method will initiate a loading of any language files in the provided directories.
-	 * @param source A class to be used for loading resources from the jar.
 	 * @param languageFileDirectory The path to the directory on the jar containing language files.
 	 * @param dataFileDirectory The path to the directory on the disk containing language files.
 	 * For example, this may include language files that have been saved to enable user customization.
 	 */
-	void setSourceDirectories(Class<?> source, String languageFileDirectory, @Nullable String dataFileDirectory);
-
-	/**
-	 * @return A class to be used for loading resources from the jar.
-	 */
-	@Nullable Class<?> source();
+	void setSourceDirectories(String languageFileDirectory, @Nullable String dataFileDirectory);
 
 	/**
 	 * @return The path to the directory on the jar containing language files.

src/main/java/org/skriptlang/skript/localization/LocalizerImpl.java

@@ -13,26 +13,19 @@ final class LocalizerImpl implements Localizer {
 		this.addon = addon;
 	}
 
-	private Class<?> source;
 	private String languageFileDirectory;
 	private String dataFileDirectory;
 
 	@Override
-	public void setSourceDirectories(Class<?> source, String languageFileDirectory, @Nullable String dataFileDirectory) {
-		if (this.source != null) {
+	public void setSourceDirectories(String languageFileDirectory, @Nullable String dataFileDirectory) {
+		if (this.languageFileDirectory != null) {
 			throw new SkriptAPIException("A localizer's source directories may only be set once.");
 		}
-		this.source = source;
 		this.languageFileDirectory = languageFileDirectory;
 		this.dataFileDirectory = dataFileDirectory;
 		Language.loadDefault(addon);
 	}
 
-	@Override
-	public @Nullable Class<?> source() {
-		return source;
-	}
-
 	@Override
 	public @Nullable String languageFileDirectory() {
 		return languageFileDirectory;
@@ -57,15 +50,10 @@ static final class UnmodifiableLocalizer implements Localizer {
 		}
 
 		@Override
-		public void setSourceDirectories(Class<?> source, String languageFileDirectory, @Nullable String dataFileDirectory) {
+		public void setSourceDirectories(String languageFileDirectory, @Nullable String dataFileDirectory) {
 			throw new UnsupportedOperationException("Cannot set the source directories of an unmodifiable Localizer.");
 		}
 
-		@Override
-		public @Nullable Class<?> source() {
-			return localizer.source();
-		}
-
 		@Override
 		public @Nullable String languageFileDirectory() {
 			return localizer.languageFileDirectory();