Rename API to append_from_text

The previous name makes no sense now that we only have one bundle.

Author: RedMser

README.md

@@ -85,7 +85,7 @@ func _init():
 
     # Godot automatically converts spaces to tabs for multi-line strings, but tabs are invalid in
     # FTL syntax. So convert tabs to four spaces. Returns an error that you should handle.
-    var err_inline = tr_inline.add_bundle_from_text("""
+    var err_inline = tr_inline.append_from_text("""
 -term = email
 HELLO =
     { $unreadEmails ->

godot/default/localization_test.gd

@@ -6,7 +6,7 @@ func _init():
 	var tr_foldername = load("res://de/german-test.ftl")
 	var tr_inline = TranslationFluent.new()
 	tr_inline.locale = "pt_PT"
-	var err_inline = tr_inline.add_bundle_from_text("""
+	var err_inline = tr_inline.append_from_text("""
 -term = email
 HELLO =
 	{ $unreadEmails ->

godot/forked/localization_test.gd

@@ -6,7 +6,7 @@ func _init():
 	var tr_foldername = load("res://de/german-test.ftl")
 	var tr_inline = TranslationFluent.new()
 	tr_inline.locale = "pt_PT"
-	var err_inline = tr_inline.add_bundle_from_text("""
+	var err_inline = tr_inline.append_from_text("""
 -term = email
 HELLO =
 	{ $unreadEmails ->

rust/src/fluent/importer.rs

@@ -73,7 +73,7 @@ impl IResourceFormatLoader for ResourceFormatLoaderFluent {
             }
         }
 
-        let err = translation.bind_mut().add_bundle_from_text(text.to_string());
+        let err = translation.bind_mut().append_from_text(text.to_string());
         if err != GdErr::OK {
             return err.ord().to_variant();
         }

rust/src/fluent/translation.rs

@@ -233,7 +233,7 @@ impl TranslationFluent {
     }
 
     #[func]
-    pub fn add_bundle_from_text(&mut self, text: String) -> GdErr {
+    pub fn append_from_text(&mut self, text: String) -> GdErr {
         let bundle = match &mut self.bundle {
             Some(bundle) => bundle,
             None => &mut {