diff --git a/CHANGELOG.md b/CHANGELOG.md
index 05ed8f9..ddda785 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@ This file documents any relevant changes done to ViUR server since version 2.
 
 ## [develop] - Current development version
 
+### Added
+- translate bone params _category_ and _tooltip_ in json renderer
+
 
 ## [2.5.0] Vesuv - 2019-06-07
 
diff --git a/render/json/default.py b/render/json/default.py
index dd5aef7..9735bf0 100644
--- a/render/json/default.py
+++ b/render/json/default.py
@@ -30,7 +30,7 @@ def renderBoneStructure(self, bone):
 			"descr": _(bone.descr),
 	        "type": bone.type,
 			"required": bone.required,
-			"params": bone.params,
+			"params": self.preprocessParams(bone.params),
 			"visible": bone.visible,
 			"readonly": bone.readOnly,
 			"unique": bone.unique
@@ -223,6 +223,22 @@ def renderEntry(self, skel, actionName, params = None):
 		request.current.get().response.headers["Content-Type"] = "application/json"
 		return json.dumps(res)
 
+	def preprocessParams(self, params):
+		"""
+		Translate params to support multilingual categories and tooltips.
+
+		:param params: Params dictionary which values should be translated. If we get no dictionary, we do nothing.
+		:type params: dict
+
+		:return: Params dictionary with translated values.
+		:rtype: dict
+		"""
+
+		if not isinstance(params, dict):
+			return params
+
+		return {key: (_(value) if key in ["category", "tooltip"] else value) for key, value in params.items()}
+
 	def view(self, skel, action="view", params = None, *args, **kwargs):
 		return self.renderEntry(skel, action, params)
 
@@ -255,10 +271,10 @@ def list(self, skellist, action = "list", params=None, **kwargs):
 
 	def editItemSuccess(self, skel, params=None, **kwargs):
 		return self.renderEntry(skel, "editSuccess", params)
-		
+
 	def addItemSuccess(self, skel, params=None, **kwargs):
 		return self.renderEntry(skel, "addSuccess", params)
-		
+
 	def addDirSuccess(self, rootNode,  path, dirname, params=None, *args, **kwargs):
 		return json.dumps("OKAY")