diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7fe2195..2187369 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - manipulation ProvideInformationAboutLastCalibration for devices
 - manipulation ProvideInformationAboutNextCalibration for devices
 - manipulation SetSystemContextActivationStateAndContextAssociation for combined settings
+- manipulation SetMdsUiLanguage for devices
+- manipulation GetMdsUiSupportedLanguages for devices
 
 ## [4.1.0] - 2024-02-22
 
diff --git a/src/t2iapi/device/device_requests.proto b/src/t2iapi/device/device_requests.proto
index 7a4c2c5..fbdc2f7 100644
--- a/src/t2iapi/device/device_requests.proto
+++ b/src/t2iapi/device/device_requests.proto
@@ -36,6 +36,15 @@ message SetLanguageRequest {
     string language = 1;  // the language to set as specified by RFC5646, e.g. en-US
 }
 
+/*
+Request to set the language of the component with a UI represented by the MDS to the given language.
+ */
+message SetMdsUiLanguageRequest {
+    string handle = 1;    // pm:MdsDescriptor/@Handle representing the component with a UI for which the language
+                          // shall be set
+    string language = 2;  // the language to set as specified by RFC5646, e.g. en-US
+}
+
 /*
 Request a list of removable descriptors of the given class.
  */
diff --git a/src/t2iapi/device/device_responses.proto b/src/t2iapi/device/device_responses.proto
index 7791096..22fbb8a 100644
--- a/src/t2iapi/device/device_responses.proto
+++ b/src/t2iapi/device/device_responses.proto
@@ -15,6 +15,15 @@ import "t2iapi/biceps/metadata.proto";
 option java_package = "com.draeger.medical.t2iapi.device";
 option java_outer_classname = "DeviceResponses";
 
+/*
+Response containing all languages supported by the UI component represented by an MDS.
+ */
+message GetMdsUiSupportedLanguagesResponse {
+    BasicResponse status = 1;
+    repeated string languages = 2;  // list of languages as specified by RFC5646 which are supported by the
+                                    // UI component represented by an MDS
+}
+
 /*
 Response which contains all descriptor handles that can be removed and reinserted into the MDIB of the device.
  */
diff --git a/src/t2iapi/device/service.proto b/src/t2iapi/device/service.proto
index 6a14d69..17c3344 100644
--- a/src/t2iapi/device/service.proto
+++ b/src/t2iapi/device/service.proto
@@ -52,6 +52,18 @@ service DeviceService {
      */
     rpc SetLanguage (t2iapi.device.SetLanguageRequest) returns (BasicResponse);
 
+    /*
+    Set the language of the component with a UI represented by the MDS to the given language.
+    The manipulated state shall be persistent until a next manipulation call. If the device is not able to maintain
+    the static state, it shall return RESULT_NOT_SUPPORTED.
+    */
+    rpc SetMdsUiLanguage (t2iapi.device.SetMdsUiLanguageRequest) returns (BasicResponse);
+
+    /*
+    Get all supported languages of the component with a UI represented by the MDS with the provided handle.
+    */
+    rpc GetMdsUiSupportedLanguages (t2iapi.BasicHandleRequest) returns (GetMdsUiSupportedLanguagesResponse);
+
     /*
     Get all descriptor handles which can be removed and reinserted into the MDIB of the device
     and whose descriptors are of the given class.
@@ -128,7 +140,7 @@ service DeviceService {
      */
     rpc ProvideInformationAboutLastCalibration (t2iapi.device.ProvideInformationAboutLastCalibrationRequest)
         returns (BasicResponse);
- 
+
      /*
     Provide information about the pm:NextCalibration for the given pm:AbstractDeviceComponentDescriptor.
     If the device is not able to provide the information, it shall return RESULT_NOT_SUPPORTED.