Full-text search: Adjust limits for allowed distance between words
A little improvement of regexp for html tags stripping
Full-text search: Hide option for Zim format in preferences if GoldenDict compiled without it support
Fix some crashes
Full-text search: Fix handling of some DSL headwords
Updated French translation: Dialog, Proxy

Signed-off-by: VirtualTam <tamisier.aurelien@gmail.com>
Full-text search: Highlight of the search results
Full-text search: Set group for ArticleView::showDefinition() when view article
Full-text search: Change vertical limit for dialog size
Full-text search: A little refactoring of dialog
Don't create new empty tab on double click outside the tab bar
A little refactoring of keys handling (old solution don't work correctly in Qt5)
Full-text search: Handle "Enter" key in headwords list
and focus dialog on Ctrl+Shift+F
Merge pull request #463 from virtualtam/master

Updated French translation: Dialog, Proxy
DSL: Fix case of several headwords per one insided card
Full-text search: Highlight words with accent mark added by DSL tag
Some more error handling
DSL: Fix headwords normalizing
Some more errors handling
Fix removing of unused FTS index files in some special cases