"widget_label", "Widget: Category Widget"
"widget_description", "CategoryWidget Description"
"widget_title", "Widget Title"
"widget_content", "Widget Content"
"category_selection", "Select categories"
"category_selection_description", "Each categories must have an image"
"category_image_width", "Image width"
"category_image_width_description", "Numbers in px"
"category_image_height", "Image height"
"category_image_height_description", "Numbers in px"
"template", "Template"
"default_template", "Default template with backgrounded image"
"other_template", "Example: Another template"
"no_model", "WidgetCategory: Please define a model."