[YQHD711]

Battery 3..9 voltage entries all carried [DisplayText("Bat Voltage (V)")], so the Quick/status views could not tell them apart. Each is now Bat3 Voltage (V) ... Bat9 Voltage (V).

Also in this PR, as separate commits:

• FlightData: initialisation is skipped when the control is instantiated inside the WinForms designer, avoiding designer-time exceptions from runtime-only dependencies.
• FlightPlanner: removed the hard-coded Simplified-Chinese modal that force-switched the default map to the China Google satellite source, and the hard-coded map-name lookup it depended on. Default map selection is no longer locale-specific.

Testing: built MissionPlanner.sln (Release, net472, VS2022); opened the Quick view and confirmed the battery entries are distinguishable; checked the FlightPlanner map selector.

[YQHD711]

Hi, first-time contributor here. The DotNet Build workflow on this PR is still showing as pending rather than running - it looks like it is waiting for approval to run on a fork PR from a first-time contributor. Could a maintainer approve the workflow when convenient? Happy to adjust anything about the change in the meantime.