UI: implement SkyCulture "Common Names" tab

[xLPMG]

In the common names tab, the user should be able to specify a list of HIP Ids or planet names, along with the english name and optional translations. From the sky culture files, it seems like the english name is required, but we might need to check the guide again.

An example of the common names in a sky culture looks like:

"common_names": {
"HIP 32349": [{"english": "Sirius"}],
"HIP 37279": [{"english": "Procyon"}],
"NAME Jupiter": [{"english": "Horus Who Binds the Two Lands", "native": "Hor-tash-tawy"}],
"NAME Mars": [{"english": "Red Horus", "native": "Horus-Desher"}],
"NAME Mercury": [{"english": "Unknown", "native": "Sebeg"}],
"NAME Moon": [{"english": "The Traveler", "native": "Khonsu"}],
"NAME Saturn": [{"english": "Horus, the Bull of Heaven", "native": "Hor-ka-Pet"}],
"NAME Sun": [{"english": "God of Sun", "native": "Amon-Ra"}],
"NAME Venus": [{"english": "Star that Crosses / The God of the Morning", "native": "Seba-Djai"}]
}