Add localization for UI strings in Greek

[stepankuzmin]

Hey 👋

This PR adds translations for UI strings we use in GL JS into Greek. We translated the UI strings automatically using the Google Translate API, and we need to verify that the translation is correct.

To help us verify the translations, you can open the Files changed tab on this page and compare the translations with the original file src/ui/default_locale.js.

To improve the machine translation, click the plus sign next to the line you want to enhance in the Files changed tab and suggest a translation.

If the translation looks good, you can approve it in the PR's comments section below.

Thanks for helping 🙌

Context	Screenshot
ID: AttributionControl.ToggleAttribution English: Toggle attribution Context: Tooltip text on AttributionControl hover
ID: AttributionControl.MapFeedback English: Map feedback Context: Accessibility label for the Improve this map link in the expanded AttributionControl. That label can be read by assistive technology
ID: FullscreenControl.Enter English: Enter fullscreen Context: Tooltip text on FullscreenControl hover when not in the fullscreen mode
ID: FullscreenControl.Exit English: Exit fullscreen Context: Tooltip text on FullscreenControl hover when in the fullscreen mode
ID: GeolocateControl.FindMyLocation English: Find my location Context: Tooltip text on GeolocateControl hover
ID: GeolocateControl.LocationNotAvailable English: Location not available Context: Tooltip text on GeolocateControl hover when we can't locate user
ID: LogoControl.Title English: Mapbox logo Context: Accessibility label for the Mapbox logo image. That label can be read by assistive technology
ID: Map.Title English: Map Context: Accessibility label for the map canvas element on the webpage. That label can be read by assistive technology
ID: NavigationControl.ResetBearing English: Reset bearing to north Context: Tooltip text on bearing button in NavigationControl
ID: NavigationControl.ZoomIn English: Zoom in Context: Tooltip text on plus button in NavigationControl
ID: NavigationControl.ZoomOut English: Zoom out Context: Tooltip text on minus button in NavigationControl
ID: ScrollZoomBlocker.CtrlMessage English: Use ctrl + scroll to zoom the map Context: Text on map blocker alert when cooperative gestures are enabled
ID: ScrollZoomBlocker.CmdMessage English: Use ⌘ + scroll to zoom the map Context: Text on map blocker alert when cooperative gestures are enabled
ID: TouchPanBlocker.Message English: Use two fingers to move the map Context: Text on map blocker alert when cooperative gestures are enabled