diff --git a/README.md b/README.md
index 2c31e49c17..940ae43403 100644
--- a/README.md
+++ b/README.md
@@ -97,7 +97,7 @@ hf.setCellContents({ sheet: sheetId, row: 0, col: 0 }, [['Monthly Payment', '=PM
 console.log(`${hf.getCellValue({ sheet: sheetId, row: 0, col: 0 })}: ${hf.getCellValue({ sheet: sheetId, row: 0, col: 1 })}`);
 ```
 
-[Run this code in CodeSandbox](https://codesandbox.io/p/sandbox/github/handsontable/hyperformula-demos/tree/3.0.x/mortgage-calculator)
+[Run this code in StackBlitz](https://stackblitz.com/github/handsontable/hyperformula-demos/tree/3.0.x/mortgage-calculator)
 
 ## Contributing
 
diff --git a/docs/examples/i18n/example1.js b/docs/examples/i18n/example1.js
index 6f97e6e1a8..16967ff0ee 100644
--- a/docs/examples/i18n/example1.js
+++ b/docs/examples/i18n/example1.js
@@ -65,7 +65,9 @@ const config = {
   licenseKey: 'gpl-v3',
 };
 
-HyperFormula.registerLanguage('enUS', enUS);
+if (!HyperFormula.getRegisteredLanguagesCodes().includes('enUS')) {
+  HyperFormula.registerLanguage('enUS', enUS);
+}
 
 // Create an empty HyperFormula instance.
 const hf = HyperFormula.buildEmpty(config);
diff --git a/docs/examples/i18n/example1.ts b/docs/examples/i18n/example1.ts
index 4b48b0c7c1..a59236f60b 100644
--- a/docs/examples/i18n/example1.ts
+++ b/docs/examples/i18n/example1.ts
@@ -67,7 +67,9 @@ const config = {
   licenseKey: 'gpl-v3',
 };
 
-HyperFormula.registerLanguage('enUS', enUS);
+if (!HyperFormula.getRegisteredLanguagesCodes().includes('enUS')) {
+  HyperFormula.registerLanguage('enUS', enUS);
+}
 
 // Create an empty HyperFormula instance.
 const hf = HyperFormula.buildEmpty(config);
diff --git a/docs/examples/localizing-functions/example1.js b/docs/examples/localizing-functions/example1.js
index 0b9af1d2bd..d7388ac47b 100644
--- a/docs/examples/localizing-functions/example1.js
+++ b/docs/examples/localizing-functions/example1.js
@@ -28,7 +28,9 @@ const tableData = [
 ];
 
 // register language
-HyperFormula.registerLanguage('frFR', frFR);
+if (!HyperFormula.getRegisteredLanguagesCodes().includes('frFR')) {
+  HyperFormula.registerLanguage('frFR', frFR);
+}
 
 // Create an empty HyperFormula instance.
 const hf = HyperFormula.buildEmpty({
diff --git a/docs/examples/localizing-functions/example1.ts b/docs/examples/localizing-functions/example1.ts
index 2a827bed4d..daa70fe052 100644
--- a/docs/examples/localizing-functions/example1.ts
+++ b/docs/examples/localizing-functions/example1.ts
@@ -30,7 +30,9 @@ const tableData = [
 ];
 
 // register language
-HyperFormula.registerLanguage('frFR', frFR);
+if (!HyperFormula.getRegisteredLanguagesCodes().includes('frFR')) {
+  HyperFormula.registerLanguage('frFR', frFR);
+}
 
 // Create an empty HyperFormula instance.
 const hf = HyperFormula.buildEmpty({
diff --git a/docs/index.md b/docs/index.md
index c73b5aa0a7..f74c47da29 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -102,7 +102,7 @@ hf.setCellContents({ sheet: sheetId, row: 0, col: 0 }, [['Monthly Payment', '=PM
 console.log(`${hf.getCellValue({ sheet: sheetId, row: 0, col: 0 })}: ${hf.getCellValue({ sheet: sheetId, row: 0, col: 1 })}`);
 ```
 
-[Run this code in CodeSandbox](https://codesandbox.io/p/sandbox/github/handsontable/hyperformula-demos/tree/3.0.x/mortgage-calculator)
+[Run this code in StackBlitz](https://stackblitz.com/github/handsontable/hyperformula-demos/tree/3.0.x/mortgage-calculator)
 
 ## Contributing