[GUI] Avoid dup hotkeys in Options window
[GUI] Avoid dup hotkeys in tray icon menu
[GUI] Avoid dup hotkeys in Sign/Verify Message window
[GUI] Avoid dup hotkeys in Send Coins tab
[GUI] Add hotkey for Remove Recipient button in Send Coins tab
[GUI] Add hotkey for Copy To Clipboard button in Sign Message tab
[GUI] Rename titles for buttons in main window

In English words usually more short than in other langs.
Panel with buttons just don't fit inline on Spanish/German/Russian
 * Send coins -> Send, Receive coins -> Receive
This is e-wallet. What user can send and receive? Only coins
 * Address Book -> Contacts
Simplification without loss of meaning
[GUI] Save & restore window's geometry
[GUI] Show Freicoin window in center of screen on first launch
[artwork] Change color scheme for buttons in main window

To show that Freicoin is sustainable ("green") currency
To distinguish interface from Bitcoin
[l10n] Update English translation
[l10n] Update German translation
[l10n] Update Russian translation
[l10n] Update Spanish translation
[l10n] Auto update translations
Merge pull request #86 from r000n/staging

Staging - GUI fixes, translations updates