diff --git a/packages/ttsl-lang/src/language/grammar/ttsl.langium b/packages/ttsl-lang/src/language/grammar/ttsl.langium
index 9544948d..7dd5e7af 100644
--- a/packages/ttsl-lang/src/language/grammar/ttsl.langium
+++ b/packages/ttsl-lang/src/language/grammar/ttsl.langium
@@ -853,7 +853,7 @@ TslAnyType returns TslAnyType:
 // -----------------------------------------------------------------------------
 
 terminal ID returns string: IDENTIFIER | '`' IDENTIFIER '`';
-terminal fragment IDENTIFIER: /[_a-zA-Z][_a-zA-Z0-9]*/;
+terminal fragment IDENTIFIER: /[_a-zA-Zäöüß][_a-zA-Zäöüß0-9]*/;
 
 terminal FLOAT returns number
     : DECIMAL_DIGIT+ '.' DECIMAL_DIGIT+ FLOAT_EXPONENT?
diff --git a/packages/ttsl-lang/src/language/validation/experimentalLanguageFeatures.ts b/packages/ttsl-lang/src/language/validation/experimentalLanguageFeatures.ts
deleted file mode 100644
index fd1ffaa4..00000000
--- a/packages/ttsl-lang/src/language/validation/experimentalLanguageFeatures.ts
+++ /dev/null
@@ -1,29 +0,0 @@
-import { AstUtils, ValidationAcceptor } from 'langium';
-import {
-    isTslDictionary,
-    type TslDictionary,
-} from '../generated/ast.js';
-import { TTSLServices } from '../ttsl-module.js';
-
-export const CODE_EXPERIMENTAL_LANGUAGE_FEATURE = 'experimental/language-feature';
-
-export const mapsShouldBeUsedWithCaution = (services: TTSLServices) => {
-    const settingsProvider = services.workspace.SettingsProvider;
-
-    return async (node: TslDictionary, accept: ValidationAcceptor) => {
-        if (!(await settingsProvider.shouldValidateExperimentalLanguageFeature())) {
-            /* c8 ignore next 2 */
-            return;
-        }
-
-        // There's already a warning on the container
-        if (AstUtils.hasContainerOfType(node.$container, isTslDictionary)) {
-            return;
-        }
-
-        accept('warning', 'Map literals are experimental and may change without prior notice.', {
-            node,
-            code: CODE_EXPERIMENTAL_LANGUAGE_FEATURE,
-        });
-    };
-};
\ No newline at end of file
diff --git a/packages/ttsl-lang/src/language/validation/ttsl-validator.ts b/packages/ttsl-lang/src/language/validation/ttsl-validator.ts
index 367fc7c9..85c8d67b 100644
--- a/packages/ttsl-lang/src/language/validation/ttsl-validator.ts
+++ b/packages/ttsl-lang/src/language/validation/ttsl-validator.ts
@@ -1,9 +1,6 @@
 import { ValidationChecks } from 'langium';
 import { TTSLAstType } from '../generated/ast.js';
 import type { TTSLServices } from '../ttsl-module.js';
-import {    
-    mapsShouldBeUsedWithCaution,
-} from './experimentalLanguageFeatures.js';
 import {
     moduleMemberMustHaveNameThatIsUniqueInPackage,
     moduleMustContainUniqueNames,
@@ -113,7 +110,7 @@ export const registerValidationChecks = function (services: TTSLServices) {
             infixOperationOperandsMustHaveCorrectType(services),
         ],
         TslList: [listMustNotContainNamedTuples(services)],
-        TslDictionary: [mapMustNotContainNamedTuples(services), mapsShouldBeUsedWithCaution(services)],
+        TslDictionary: [mapMustNotContainNamedTuples(services)],
         TslModule: [
             moduleMemberMustHaveNameThatIsUniqueInPackage(services),
             moduleMustContainUniqueNames,