Fixes and other improvements

New

• Added Basque translation (thanks to @alexgabi)

Changes

• Updated to Italian translation (thanks to @albanobattistella)
• Updated to Brazilian Portugese translation (thanks to Felipe Simoes)
• Opening a file will automatically close an existing unsaved, unchanged tab.
• Changed color of connection drag handles to yellow.
• Making it easier to grab connection drag handle when it is close to connection handles.
• Reducing auto-saves when editing node text.

Bug Fixes

• Removed help information from PNG export panel.
• Fixed issue with exporting images with connections/stickers which could get cropped out.
• Fixed issue with empty tab when file cannot be loaded.
• Fixed issues with application crashes on startup in non-elementary environments.