diff --git a/.idea/go-thousands.iml b/.idea/go-thousands.iml
new file mode 100644
index 0000000..7ee078d
--- /dev/null
+++ b/.idea/go-thousands.iml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module version="4">
+  <component name="Go" enabled="true" />
+</module>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index c10e400..b2d0a8d 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -4,9 +4,7 @@
     <option name="autoReloadType" value="ALL" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="d5f54382-616d-41b2-b8f9-53d04e37d644" name="Changes" comment="first version">
-      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-    </list>
+    <list default="true" id="d5f54382-616d-41b2-b8f9-53d04e37d644" name="Changes" comment="switch back changes" />
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
     <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
@@ -32,28 +30,59 @@
     <option name="hideEmptyMiddlePackages" value="true" />
     <option name="showLibraryContents" value="true" />
   </component>
-  <component name="PropertiesComponent"><![CDATA[{
-  "keyToString": {
-    "DefaultGoTemplateProperty": "Go File",
-    "RunOnceActivity.ShowReadmeOnStart": "true",
-    "RunOnceActivity.go.formatter.settings.were.checked": "true",
-    "RunOnceActivity.go.migrated.go.modules.settings": "true",
-    "RunOnceActivity.go.modules.go.list.on.any.changes.was.set": "true",
-    "WebServerToolWindowFactoryState": "false",
-    "go.import.settings.migrated": "true",
-    "last_opened_file_path": "/var/www/GoProjects/oldperl/go-thousands",
-    "node.js.detected.package.eslint": "true",
-    "node.js.selected.package.eslint": "(autodetect)"
+  <component name="PropertiesComponent">{
+  &quot;keyToString&quot;: {
+    &quot;DefaultGoTemplateProperty&quot;: &quot;Go File&quot;,
+    &quot;RunOnceActivity.ShowReadmeOnStart&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.go.formatter.settings.were.checked&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.go.migrated.go.modules.settings&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.go.modules.go.list.on.any.changes.was.set&quot;: &quot;true&quot;,
+    &quot;WebServerToolWindowFactoryState&quot;: &quot;false&quot;,
+    &quot;go.import.settings.migrated&quot;: &quot;true&quot;,
+    &quot;last_opened_file_path&quot;: &quot;/var/www/GoProjects/oldperl/go-thousands&quot;,
+    &quot;node.js.detected.package.eslint&quot;: &quot;true&quot;,
+    &quot;node.js.selected.package.eslint&quot;: &quot;(autodetect)&quot;
   }
-}]]></component>
+}</component>
+  <component name="RunManager">
+    <configuration default="true" type="GoApplicationRunConfiguration" factoryName="Go Application">
+      <module name="go-thousands" />
+      <working_directory value="$PROJECT_DIR$" />
+      <kind value="FILE" />
+      <directory value="$PROJECT_DIR$" />
+      <filePath value="$PROJECT_DIR$" />
+      <method v="2" />
+    </configuration>
+    <configuration default="true" type="GoTestRunConfiguration" factoryName="Go Test">
+      <module name="go-thousands" />
+      <working_directory value="$PROJECT_DIR$" />
+      <kind value="DIRECTORY" />
+      <directory value="$PROJECT_DIR$" />
+      <filePath value="$PROJECT_DIR$" />
+      <framework value="gotest" />
+      <method v="2" />
+    </configuration>
+  </component>
   <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
   <component name="TypeScriptGeneratedFilesManager">
     <option name="version" value="3" />
   </component>
+  <component name="Vcs.Log.Tabs.Properties">
+    <option name="TAB_STATES">
+      <map>
+        <entry key="MAIN">
+          <value>
+            <State />
+          </value>
+        </entry>
+      </map>
+    </option>
+  </component>
   <component name="VcsManagerConfiguration">
     <MESSAGE value="init" />
     <MESSAGE value="first version" />
-    <option name="LAST_COMMIT_MESSAGE" value="first version" />
+    <MESSAGE value="switch back changes" />
+    <option name="LAST_COMMIT_MESSAGE" value="switch back changes" />
   </component>
   <component name="VgoProject">
     <settings-migrated>true</settings-migrated>
diff --git a/go.mod b/go.mod
index 906ff99..8ed568e 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,5 @@
 module gitport.de/oldperl/go-thousands
 
 go 1.24
+
+require golang.org/x/text v0.26.0
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..b69360c
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+golang.org/x/text v0.26.0 h1:P42AVeLghgTYr4+xUnTRKDMqpar+PtX7KWuNQL21L8M=
+golang.org/x/text v0.26.0/go.mod h1:QK15LZJUUQVJxhz7wXgxSy/CJaTFjd0G+YLonydOVQA=
diff --git a/thousands.go b/thousands.go
index 28c3c8c..81ca405 100644
--- a/thousands.go
+++ b/thousands.go
@@ -2,12 +2,19 @@ package thousands
 
 import (
 	"fmt"
-	"strings"
+	language2 "golang.org/x/text/language"
+	"golang.org/x/text/message"
 )
 
 func Separate(Number interface{}, language ...string) (string, error) {
 
-	switch Number.(type) {
+	lang := map[string]string{"de": "German", "en": "English"}
+	useLang := lang[language[0]]
+
+	p := message.NewPrinter(language2.Make(useLang))
+	formattedNumber := ""
+
+	switch n := Number.(type) {
 	case int:
 	case int8:
 	case int16:
@@ -17,9 +24,13 @@ func Separate(Number interface{}, language ...string) (string, error) {
 	case float64:
 
 	default:
-		return "", fmt.Errorf("no valid number format")
+		return "", fmt.Errorf("%T is no valid number format", n)
 	}
 
+	formattedNumber = p.Sprintf("%f", Number)
+
+	/**
+
 	formattedNumber := fmt.Sprintf("%.2f", Number)
 
 	if len(language) < 1 {
@@ -95,6 +106,6 @@ func Separate(Number interface{}, language ...string) (string, error) {
 
 		return formattedNumber, nil
 	}
-
+	*/
 	return formattedNumber, nil
 }