Some more year-related translation updates by Daniele Di Pisa.
Fix send word to main window for new UI when history view mode is on
Configurable parameter for DSL headwords' maximum size.

By default, it is unchanged, still 256.

In those rare cases when users really need more lengthy
headwords, they could adjust the config file,
maxHeadwordSize parameter.
More reliable transfer of focus from the suggestions list back to the translate line.

Fixes some problems when focus is lost, transferred to random other components, like
buttons or tabbars.
Update locale/lt_LT.ts
Merge pull request #160 from embar-/patch-2

Update locale/lt_LT.ts
Add belarusian translation

Add belarusian translation in cyrillic and latin alphabet
Merge pull request #163 from QuendiMax/master

Add belarusian localization
History Pane rewrite.

The new History Pane features proper mouse and keyboard navigation,
multiple selection and ability to remove the selected entries,
plus a dynamic context menu. Additionaly, the History's size is now
configurable in Preferences.

Use Ctrl+H to show/hide the History Pane.

History Pane's titlebar can be styled via #historyPaneTitleBar, e.g.:

/* Colored header for the History Pane */
  background: lightsteelblue;
  margin: 2px;
}

Closes #162: Make History sidebar independent from the Search Pane
Closes #159: "Send to main window" button from Pop-Up window does nothing when History is shown
Closes #158: Preserve History mode after restart
Closes #157: History with new UI: New words are not added when History is shown
Closes #156: History with new UI: Extra Groups widget in History is shown
Closes #155: History with new UI: Arrow keys navigation in History doesn't work
Closes #154: History with new UI: DEL key does not delete the current history entry
Implemented History copying to the clipboard