Fix server ignoring fallback for translatable components (#9134)

LICENSE.md

@@ -58,4 +58,5 @@ Jakubk15 <jakubk15@protonmail.com>
 Redned <redned235@gmail.com>
 Luke Chambers <consolelogluke@gmail.com>
 Emily <emilia.lopezf.1999@gmail.com>
+dawon <dawon@dawon.eu>
 ```

patches/server/Adventure.patch

@@ -799,7 +799,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +                    }
 +                }
 +            }
-+            final @NotNull String translated = Language.getInstance().getOrDefault(translatable.key());
++            final @Nullable String fallback = translatable.fallback();
++            final @NotNull String translated = Language.getInstance().getOrDefault(translatable.key(), fallback != null ? fallback : translatable.key());
 +
 +            final Matcher matcher = LOCALIZATION_PATTERN.matcher(translated);
 +            final List<Component> args = translatable.args();