feat(framework): add default values for language/theme

docs/2-advanced/01-configuration.md

@@ -52,7 +52,12 @@ Example:
 import { setTheme } from "@ui5/webcomponents-base/dist/config/Theme.js";
 setTheme("sap_belize_hcb");
 ```
-
+
+- To reset the theme to the default one:
+```js
+import { setTheme, getDefaultTheme } from "@ui5/webcomponents-base/dist/config/Theme.js";
+setTheme(getDefaultTheme());
+```
 
 ### language
 <a name="language"></a>
@@ -88,6 +93,12 @@ import { setLanguage } from "@ui5/webcomponents-base/dist/config/Language.js";
 setLanguage("fr");
 ```
 
+- To reset the langauge to the default one:
+```js
+import { setLanguage, getDefaultLanguage } from "@ui5/webcomponents-base/dist/config/Language.js";
+setLanguage(getDefaultLanguage());
+```
+
 
 ### animationMode
 <a name="animationMode"></a>

packages/base/src/config/Language.ts

@@ -4,6 +4,7 @@ import {
 } from "../InitialConfiguration.js";
 import { fireLanguageChange } from "../locale/languageChange.js";
 import { reRenderAllUI5Elements } from "../Render.js";
+import { DEFAULT_LANGUAGE } from "../generated/AssetParameters.js";
 
 let curLanguage: string | undefined;
 let fetchDefaultLanguage: boolean;
@@ -39,6 +40,18 @@ const setLanguage = async (language: string): Promise<void> => {
 	await reRenderAllUI5Elements({ languageAware: true });
 };
 
+/**
+ * Returns the default languague.
+ *
+ * Note: Default language might be different than the configurated one.
+ *
+ * @public
+ * @returns {string}
+ */
+const getDefaultLanguage = (): string => {
+	return DEFAULT_LANGUAGE;
+};
+
 /**
  * Defines if the default language, that is inlined, should be
  * fetched over the network instead of using the inlined one.
@@ -67,6 +80,7 @@ const getFetchDefaultLanguage = (): boolean => {
 export {
 	getLanguage,
 	setLanguage,
+	getDefaultLanguage,
 	setFetchDefaultLanguage,
 	getFetchDefaultLanguage,
 };

packages/base/src/config/Theme.ts

@@ -1,6 +1,7 @@
 import { getTheme as getConfiguredTheme } from "../InitialConfiguration.js";
 import { reRenderAllUI5Elements } from "../Render.js";
 import applyTheme from "../theming/applyTheme.js";
+import { DEFAULT_THEME } from "../generated/AssetParameters.js";
 
 let curTheme: string;
 
@@ -35,6 +36,18 @@ const setTheme = async (theme: string): Promise<void> => {
 	await reRenderAllUI5Elements({ themeAware: true });
 };
 
+/**
+ * Returns the default theme.
+ *
+ * Note: Default theme might be different than the configurated one.
+ *
+ * @public
+ * @returns {string}
+ */
+const getDefaultTheme = (): string => {
+	return DEFAULT_THEME;
+};
+
 /**
  * Returns if the given theme name is the one currently applied.
  * @private
@@ -61,4 +74,5 @@ export {
 	setTheme,
 	isTheme,
 	isThemeFamily,
+	getDefaultTheme,
 };