Add option to download missing stylesheets on startup

data/ru.mse-locale/locale

@@ -1,4 +1,4 @@
-mse version: 2.5.8
+mse version: 2.6.0
 installer group: Magic Set Editor/translations/russian
 full name: Русский (Russian)
 version: 2026-02-28
@@ -648,6 +648,16 @@ label:
 	stylesheet not found:
 		Сет, который ты пытаешься открыть использует стиль "%s".
 		Этого стиля не найдено в твоей системе, выбери альтернативу
+	#TODO: Localize
+	searching online:					Searching online...
+	#TODO: Localize
+	searching online fail:				Not found online
+	#TODO: Localize
+	found online downloading:			Found online! Downloading...
+	#TODO: Localize
+	found online installing:			Found online! Installing...
+	#TODO: Localize
+	found online fail:					Installation failed
 
 	# preferences dialog
 	language:							Язык
@@ -946,6 +956,10 @@ button:
 	upgrade group:						Обновить все
 	remove group:						Удалить все
 
+	# stylesheet not found dialog
+	#TODO: Localize
+	find package online:				Search Online
+
 ############################################################## Titles in the GUI
 title:
 	# window titles
@@ -1114,6 +1128,12 @@ error:
 	file not found package like:
 		File not found: '%s' in package '%s'
 		If you are trying to open a file from another package, use "/package/filename"
+	#TODO: Localize
+	file not found package like init:
+		File not found: '%s' in package '%s'
+		If this folder is empty or unused, delete it.
+	#TODO: Localize
+	package name parse error:			Unable to parse package name '%s'
 	file parse error:
 		Error while parsing file: '%s'
 		%s