Update languages.nsh

updated and fixed slovak translation of windows installer
Merge pull request #1232 from dagsoftware/patch-3

Update languages.nsh
Open links in private window.
[Bookmarks] Add new action to open bookmarks in private window

Closes #995
[Code] Fixed cppcheck issues
[TabBar] Option to show/hide close button on inactive tabs. Closes #1220
[TabBar] Comment fix
Merge pull request #1242 from pejakm/tabsv2

Option to show/hide close button on inactive tabs. Closes #1220
[PinnedTabs] Restore pinned tabs also when not restoring session

Closes #1239
[AdBlock] Don't add domain css rules to sites whitelisted with $document option

Closes #1246
Fixed, renamed QupZilla class to BrowserWindow everywhere
[Code] Little cleanups after rename QupZilla -> BrowserWindow
[Code] Renamed qz_namespace.h to qzcommon.h
[Scripts] generate-translations now generate also .qrc lines
[Code] Moved history menu into separate HistoryMenu class
[HistoryMenu] Improvements
Merge pull request #1248 from pejakm/stfx

[HistoryMenu] Improvements
Fix regression after 2a6896e57fe75bf667a12a93295bf3ea757191f6
[LocationCompleter] Support Ctrl / Shift activation of items

Ctrl activation: Opens url in new tab
Shift activation: Opens url in new window
Closes #1245

Bookmarks: Update visit count also from location completer
BookmarkItem: Added new method updateVisitCount
[BookmarksSidebar] Enable only SingleSelection in sidebar