Child label filter

• Child label filter tree to easely select and explore articles with two labels
• Search articles in visible article set (in selected feed, group, label etc)
• Search operators AND & OR
• Article list: day spearator
• Article list menu: Share starred articles via text & via file, group by labels if no label selected
• Article list settings: Show text in article list (accessible from menu also). This global setting is independent of per feed checkbox to show article text.
• Do not auto mark favourite article as read
• RSS feeds parser: exract title from content if it is absent
• Header: remaining page info: page count added
• Feed list sort setting moved from Advanced to Feed list screen
• Do not update date for without a feed & rss articles
• Translation update
• Bug fixes