NiceDB 0.2.2

• Simplified Chinese interface, contributed by @YNM9000.
• Pointers in the style: arrow, text cursor and handles drawn in each style's shape and colours, with a size setting. Existing installs are asked once; Settings › Appearance turns them off.
• Switching an open connection to production locks it and shows the unlock control at once, without reopening.
• Update notes in English for languages other than Italian.