diff --git a/docs_md/changelog.md b/docs_md/changelog.md
index 8f35d96..4c73051 100644
--- a/docs_md/changelog.md
+++ b/docs_md/changelog.md
@@ -138,4 +138,6 @@ Desc
 
 - Input component: rename field _selected_ to _is_selected_ (according to the docs)
 - Add EmmyLua annotations. See how to use it FAQ
-- **#116** You can pass Text component in Input component instead of text node
\ No newline at end of file
+- Lang text now can be initialized without default locale id
+- **#116** You can pass Text component in Input component instead of text node
+- **#124** Add _set_click_zone_ functon to Scroll component (just link to Drag:set_click_zone inside scroll component)
diff --git a/druid/base/drag.lua b/druid/base/drag.lua
index 8632929..9263e29 100644
--- a/druid/base/drag.lua
+++ b/druid/base/drag.lua
@@ -263,9 +263,9 @@ end
 --- Strict drag click area. Useful for
 -- restrict events outside stencil node
 -- @tparam Drag self
--- @tparam node zone Gui node
-function Drag.set_click_zone(self, zone)
-	self.click_zone = self:get_node(zone)
+-- @tparam node node Gui node
+function Drag.set_click_zone(self, node)
+	self.click_zone = self:get_node(node)
 end
 
 
diff --git a/druid/base/scroll.lua b/druid/base/scroll.lua
index 4c532ca..c7681ae 100644
--- a/druid/base/scroll.lua
+++ b/druid/base/scroll.lua
@@ -379,6 +379,15 @@ function Scroll.bind_grid(self, grid)
 end
 
 
+--- Strict drag scroll area. Useful for
+-- restrict events outside stencil node
+-- @tparam Drag self
+-- @tparam node node Gui node
+function Scroll.set_click_zone(self, node)
+	self.drag:set_click_zone(node)
+end
+
+
 function Scroll._on_scroll_drag(self, dx, dy)
 	local t = self.target_position
 	local b = self.available_pos
diff --git a/druid/const.lua b/druid/const.lua
index c50cf8e..9f1fc0d 100644
--- a/druid/const.lua
+++ b/druid/const.lua
@@ -51,6 +51,10 @@ M.PIVOTS = {
 }
 
 
+M.SYS_INFO = sys.get_sys_info()
+M.CURRENT_SYSTEM_NAME = M.SYS_INFO.system_name
+
+
 M.OS = {
 	ANDROID = "Android",
 	IOS = "iPhone OS",
diff --git a/druid/extended/lang_text.lua b/druid/extended/lang_text.lua
index b62aa6e..64479d1 100644
--- a/druid/extended/lang_text.lua
+++ b/druid/extended/lang_text.lua
@@ -21,7 +21,7 @@ local LangText = component.create("lang_text", { component.ON_LANGUAGE_CHANGE })
 --- Component init function
 -- @tparam LangText self
 -- @tparam node node The text node
--- @tparam string locale_id Default locale id
+-- @tparam string locale_id Default locale id, optional
 -- @tparam bool no_adjust If true, will not correct text size
 function LangText.init(self, node, locale_id, no_adjust)
 	self.druid = self:get_druid()
@@ -30,7 +30,9 @@ function LangText.init(self, node, locale_id, no_adjust)
 
 	self.on_change = Event()
 
-	self:translate(locale_id)
+	if locale_id then
+		self:translate(locale_id)
+	end
 
 	return self
 end
@@ -59,7 +61,7 @@ end
 function LangText.translate(self, locale_id, ...)
 	self.last_locale_args = {...}
 	self.last_locale = locale_id or self.last_locale
-	self.text:set_to(settings.get_text(self.last_locale, ...))
+	self.text:set_to(settings.get_text(self.last_locale, ...) or "")
 end
 
 
diff --git a/druid/helper.lua b/druid/helper.lua
index 590f5ae..cc83abc 100644
--- a/druid/helper.lua
+++ b/druid/helper.lua
@@ -5,6 +5,7 @@ local const = require("druid.const")
 
 local M = {}
 
+local system_name = sys.get_sys_info().system_name
 
 --- Text node or icon node can be nil
 local function get_text_width(text_node)
@@ -182,16 +183,14 @@ end
 --- Check if device is mobile (Android or iOS)
 -- @function helper..is_mobile
 function M.is_mobile()
-	local system_name = sys.get_sys_info().system_name
-	return system_name == const.OS.IOS or system_name == const.OS.ANDROID
+	return const.CURRENT_SYSTEM_NAME == const.OS.IOS or const.CURRENT_SYSTEM_NAME == const.OS.ANDROID
 end
 
 
 --- Check if device is HTML5
 -- @function helper.is_web
 function M.is_web()
-	local system_name = sys.get_sys_info().system_name
-	return system_name == const.OS.BROWSER
+	return const.CURRENT_SYSTEM_NAME == const.OS.BROWSER
 end