diff --git a/integration/admin-client/src/main/java/org/keycloak/admin/client/resource/RealmLocalizationResource.java b/integration/admin-client/src/main/java/org/keycloak/admin/client/resource/RealmLocalizationResource.java
index 51b84915c5..6e94da5cce 100755
--- a/integration/admin-client/src/main/java/org/keycloak/admin/client/resource/RealmLocalizationResource.java
+++ b/integration/admin-client/src/main/java/org/keycloak/admin/client/resource/RealmLocalizationResource.java
@@ -23,6 +23,7 @@ import java.util.Map;
 import javax.ws.rs.Consumes;
 import javax.ws.rs.DELETE;
 import javax.ws.rs.GET;
+import javax.ws.rs.POST;
 import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
@@ -59,4 +60,9 @@ public interface RealmLocalizationResource {
     @PUT
     @Consumes(MediaType.TEXT_PLAIN)
     void saveRealmLocalizationText(@PathParam("locale") String locale, @PathParam("key") String key, String text);
+
+    @Path("{locale}")
+    @POST
+    @Consumes("application/json")
+    void createOrUpdateRealmLocalizationTexts(@PathParam("locale") String locale, Map<String, String> localizationTexts);
 }
diff --git a/model/infinispan/src/main/java/org/keycloak/models/cache/infinispan/RealmAdapter.java b/model/infinispan/src/main/java/org/keycloak/models/cache/infinispan/RealmAdapter.java
index af08724645..69508c3e8d 100755
--- a/model/infinispan/src/main/java/org/keycloak/models/cache/infinispan/RealmAdapter.java
+++ b/model/infinispan/src/main/java/org/keycloak/models/cache/infinispan/RealmAdapter.java
@@ -1698,9 +1698,9 @@ public class RealmAdapter implements CachedRealmModel {
     }
 
     @Override
-    public void patchRealmLocalizationTexts(String locale, Map<String, String> localizationTexts) {
+    public void createOrUpdateRealmLocalizationTexts(String locale, Map<String, String> localizationTexts) {
         getDelegateForUpdate();
-        updated.patchRealmLocalizationTexts(locale, localizationTexts);
+        updated.createOrUpdateRealmLocalizationTexts(locale, localizationTexts);
     }
 
     @Override
diff --git a/model/jpa/src/main/java/org/keycloak/models/jpa/RealmAdapter.java b/model/jpa/src/main/java/org/keycloak/models/jpa/RealmAdapter.java
index 2c87393d10..5beb63ec4d 100755
--- a/model/jpa/src/main/java/org/keycloak/models/jpa/RealmAdapter.java
+++ b/model/jpa/src/main/java/org/keycloak/models/jpa/RealmAdapter.java
@@ -2173,11 +2173,13 @@ public class RealmAdapter implements RealmModel, JpaModel<RealmEntity> {
     }
 
     @Override
-    public void patchRealmLocalizationTexts(String locale, Map<String, String> localizationTexts) {
+    public void createOrUpdateRealmLocalizationTexts(String locale, Map<String, String> localizationTexts) {
         Map<String, RealmLocalizationTextsEntity> currentLocalizationTexts = realm.getRealmLocalizationTexts();
         if(currentLocalizationTexts.containsKey(locale)) {
             RealmLocalizationTextsEntity localizationTextsEntity = currentLocalizationTexts.get(locale);
-            localizationTextsEntity.getTexts().putAll(localizationTexts);
+            Map<String, String> updatedTexts = new HashMap<>(localizationTextsEntity.getTexts());
+            updatedTexts.putAll(localizationTexts);
+            localizationTextsEntity.setTexts(updatedTexts);
 
             em.persist(localizationTextsEntity);
         }
diff --git a/model/map/src/main/java/org/keycloak/models/map/realm/MapRealmAdapter.java b/model/map/src/main/java/org/keycloak/models/map/realm/MapRealmAdapter.java
index 4222bfeaa9..2b0fd3e24b 100644
--- a/model/map/src/main/java/org/keycloak/models/map/realm/MapRealmAdapter.java
+++ b/model/map/src/main/java/org/keycloak/models/map/realm/MapRealmAdapter.java
@@ -1294,7 +1294,7 @@ public class MapRealmAdapter extends AbstractRealmModel<MapRealmEntity> implemen
     }
 
     @Override
-    public void patchRealmLocalizationTexts(String locale, Map<String, String> localizationTexts) {
+    public void createOrUpdateRealmLocalizationTexts(String locale, Map<String, String> localizationTexts) {
         Map<String, Map<String, String>> realmLocalizationTexts = entity.getLocalizationTexts();
 
         if (realmLocalizationTexts.containsKey(locale)) {
diff --git a/model/map/src/main/java/org/keycloak/models/map/realm/MapRealmProvider.java b/model/map/src/main/java/org/keycloak/models/map/realm/MapRealmProvider.java
index f42dc791db..4def40064e 100644
--- a/model/map/src/main/java/org/keycloak/models/map/realm/MapRealmProvider.java
+++ b/model/map/src/main/java/org/keycloak/models/map/realm/MapRealmProvider.java
@@ -175,7 +175,7 @@ public class MapRealmProvider implements RealmProvider {
         if (! updateLocalizationText(realm, locale, key, text)) {
             Map<String, String> texts = new HashMap<>();
             texts.put(key, text);
-            realm.patchRealmLocalizationTexts(locale, texts);
+            realm.createOrUpdateRealmLocalizationTexts(locale, texts);
         }
     }
 
@@ -183,7 +183,7 @@ public class MapRealmProvider implements RealmProvider {
     @Override
     public void saveLocalizationTexts(RealmModel realm, String locale, Map<String, String> localizationTexts) {
         if (locale == null || localizationTexts == null) return;
-        realm.patchRealmLocalizationTexts(locale, localizationTexts);
+        realm.createOrUpdateRealmLocalizationTexts(locale, localizationTexts);
     }
 
     //TODO move the following method to adapter
@@ -192,7 +192,7 @@ public class MapRealmProvider implements RealmProvider {
         if (locale == null || key == null || text == null || (! realm.getRealmLocalizationTextsByLocale(locale).containsKey(key))) return false;
         Map<String, String> texts = new HashMap<>(realm.getRealmLocalizationTextsByLocale(locale));
         texts.replace(key, text);
-        realm.patchRealmLocalizationTexts(locale, texts);
+        realm.createOrUpdateRealmLocalizationTexts(locale, texts);
         return true;
     }
 
@@ -210,7 +210,7 @@ public class MapRealmProvider implements RealmProvider {
         Map<String, String> texts = new HashMap<>(realm.getRealmLocalizationTextsByLocale(locale));
         texts.remove(key);
         realm.removeRealmLocalizationTexts(locale);
-        realm.patchRealmLocalizationTexts(locale, texts);
+        realm.createOrUpdateRealmLocalizationTexts(locale, texts);
         return true;
     }
 
diff --git a/server-spi/src/main/java/org/keycloak/models/RealmModel.java b/server-spi/src/main/java/org/keycloak/models/RealmModel.java
index 4145a78e71..087b14024c 100755
--- a/server-spi/src/main/java/org/keycloak/models/RealmModel.java
+++ b/server-spi/src/main/java/org/keycloak/models/RealmModel.java
@@ -992,10 +992,11 @@ public interface RealmModel extends RoleContainerModel {
     void removeDefaultClientScope(ClientScopeModel clientScope);
 
     /**
-     * Patches the realm-specific localization texts. This method will not delete any text.
+     * Creates or updates the realm-specific localization texts for the given locale.
+     * This method will not delete any text.
      * It updates texts, which are already stored or create new ones if the key does not exist yet.
      */
-    void patchRealmLocalizationTexts(String locale, Map<String, String> localizationTexts);
+    void createOrUpdateRealmLocalizationTexts(String locale, Map<String, String> localizationTexts);
     boolean removeRealmLocalizationTexts(String locale);
     Map<String, Map<String, String>> getRealmLocalizationTexts();
     Map<String, String> getRealmLocalizationTextsByLocale(String locale);
diff --git a/services/src/main/java/org/keycloak/services/resources/admin/RealmLocalizationResource.java b/services/src/main/java/org/keycloak/services/resources/admin/RealmLocalizationResource.java
index 0ab2f99a62..ad5a46d37b 100644
--- a/services/src/main/java/org/keycloak/services/resources/admin/RealmLocalizationResource.java
+++ b/services/src/main/java/org/keycloak/services/resources/admin/RealmLocalizationResource.java
@@ -84,8 +84,8 @@ public class RealmLocalizationResource {
     @POST
     @Path("{locale}")
     @Consumes(MediaType.MULTIPART_FORM_DATA)
-    public void patchRealmLocalizationTextsFromFile(@PathParam("locale") String locale, MultipartFormDataInput input)
-            throws IOException {
+    public void createOrUpdateRealmLocalizationTextsFromFile(@PathParam("locale") String locale,
+            MultipartFormDataInput input) {
         this.auth.realm().requireManageRealm();
 
         Map<String, List<InputPart>> formDataMap = input.getFormDataMap();
@@ -97,18 +97,19 @@ public class RealmLocalizationResource {
             TypeReference<HashMap<String, String>> typeRef = new TypeReference<HashMap<String, String>>() {
             };
             Map<String, String> rep = JsonSerialization.readValue(inputStream, typeRef);
-            realm.patchRealmLocalizationTexts(locale, rep);
+            realm.createOrUpdateRealmLocalizationTexts(locale, rep);
         } catch (IOException e) {
             throw new BadRequestException("Could not read file.");
         }
     }
 
-    @PATCH
+    @POST
     @Path("{locale}")
     @Consumes(MediaType.APPLICATION_JSON)
-    public void patchRealmLocalizationTexts(@PathParam("locale") String locale, Map<String, String> loclizationTexts) {
+    public void createOrUpdateRealmLocalizationTexts(@PathParam("locale") String locale,
+            Map<String, String> localizationTexts) {
         this.auth.realm().requireManageRealm();
-        realm.patchRealmLocalizationTexts(locale, loclizationTexts);
+        realm.createOrUpdateRealmLocalizationTexts(locale, localizationTexts);
     }
 
     @Path("{locale}")
diff --git a/testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/admin/RealmLocalizationResourceTest.java b/testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/admin/RealmLocalizationResourceTest.java
index 151082a089..b49c40ae43 100644
--- a/testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/admin/RealmLocalizationResourceTest.java
+++ b/testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/admin/RealmLocalizationResourceTest.java
@@ -17,15 +17,16 @@
 
 package org.keycloak.testsuite.admin;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertThat;
 
 import org.hamcrest.CoreMatchers;
 import org.junit.Before;
 import org.junit.Test;
 import org.keycloak.admin.client.resource.RealmLocalizationResource;
 
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -44,6 +45,7 @@ public class RealmLocalizationResourceTest extends AbstractAdminTest {
 
         getCleanup().addLocalization("en");
         getCleanup().addLocalization("de");
+        getCleanup().addLocalization("es");
 
         resource = adminClient.realm(REALM_NAME).localization();
     }
@@ -127,4 +129,31 @@ public class RealmLocalizationResourceTest extends AbstractAdminTest {
 
         assertThat(localizations, CoreMatchers.hasItems("de"));
     }
+
+    @Test
+    public void createOrUpdateRealmLocalizationWhenLocaleDoesNotYetExist() {
+        final Map<String, String> newLocalizationTexts = new HashMap<>();
+        newLocalizationTexts.put("key-a", "text-a_es");
+        newLocalizationTexts.put("key-b", "text-b_es");
+
+        resource.createOrUpdateRealmLocalizationTexts("es", newLocalizationTexts);
+
+        final Map<String, String> persistedLocalizationTexts = resource.getRealmLocalizationTexts("es");
+        assertEquals(newLocalizationTexts, persistedLocalizationTexts);
+    }
+
+    @Test
+    public void createOrUpdateRealmLocalizationWhenLocaleAlreadyExists() {
+        final Map<String, String> newLocalizationTexts = new HashMap<>();
+        newLocalizationTexts.put("key-b", "text-b_changed_en");
+        newLocalizationTexts.put("key-c", "text-c_en");
+
+        resource.createOrUpdateRealmLocalizationTexts("en", newLocalizationTexts);
+
+        final Map<String, String> expectedLocalizationTexts = new HashMap<>();
+        expectedLocalizationTexts.put("key-a", "text-a_en");
+        expectedLocalizationTexts.putAll(newLocalizationTexts);
+        final Map<String, String> persistedLocalizationTexts = resource.getRealmLocalizationTexts("en");
+        assertEquals(expectedLocalizationTexts, persistedLocalizationTexts);
+    }
 }