add strikethrough

data/en.mse-locale/locale

@@ -81,6 +81,7 @@ menu:
 	bold:								&Bold	Ctrl+B
 	italic:								&Italic	Ctrl+I
 	underline:							&Underline	Ctrl+U
+	strikethrough:						Strikethrough
 	symbols:							&Symbols	Ctrl+M
 	reminder text:						&Reminder Text	Ctrl+R
 	insert symbol:						I&nsert Symbol
@@ -215,6 +216,7 @@ help:
 	bold:								Makes the selected text bold
 	italic:								Makes the selected text italic
 	underline:							Makes the selected text underlined
+	strikethrough:						Makes the selected text struck through
 	symbols:							Draws the selected text with symbols
 	reminder text:						Show reminder text for the selected keyword
 
@@ -444,6 +446,7 @@ tooltip:
 	bold:								Bold
 	italic:								Italic
 	underline:							Underline
+	strikethrough:						Strikethrough
 	symbols:							Symbols
 	reminder text:						Reminder Text
 
@@ -947,16 +950,20 @@ error:
 	# image import
 	import not found:					File not found: '%s'
 	can't import image without set:		Must first save or load a set file before importing file: '%s'
+	can't download image without set:	Must first save or load a set file before downloading file: '%s'
 	can't create file stream:			Failed to create file stream: '%s'
 	can't write image to set:			Failed to write image to set: '%s'
 	can't import image:					Failed to import image: '%s'
+	can't download image:				Failed to download image: '%s'
+	import not image:					Filepath does not point to an image: '%s'
+	download not image:					URL does not point to an image: '%s'
 
 	# card creation
 	no field with name:					Could not find %s field named '%s'
 	styling data not map:				Given value for '%s_data' is not a map
 	styling data without stylesheet:	Given value for '%s_data' before a stylesheet was set
 	cant set value:						Can not set card value '%s', it is not of the right type
-	cant set image value:				Can only set image value with a relative filename from within the package, or with the import_image function, in field named '%s'
+	cant set image value:				Can only set image value with a relative filename from within the package, or with the import_image/download_image functions, in field named '%s'
 	cant set symbol value:				Can only set symbol value with a relative filename from within the package, in field named '%s'
 	add card csv file not found:		Could not find or load the CSV or TSV file
 	add card csv file malformed:		CSV or TSV file malformed, row '%s' does not have the same number of entries as the first row