The name for a new Sheet1 is hardcoded in buildFromSheet method

[wojciechczerniak]

Description

The name of the auto-generated sheet should be Arkusz1 if the language was set to PL.

hyperformula/src/BuildEngineFromArraysFactory.ts

Lines 66 to 68 in e5ff28e

	public buildFromSheet(sheet: Sheet, config: Config = new Config()): HyperFormula {
	return this.buildFromSheets({Sheet1: sheet}, config)
	}

Steps to reproduce

const engine = HyperFormula.buildFromArray([[ ... ]], { language: plPL })

expect(engine.getSheetName(0)).toEqual('Arkusz1')

or

  it('#buildFromSheet adds default sheet Arkusz1 when language is set to plPL', () => {
    const config = new Config({language: plPL })
    const engine = HyperFormula.buildFromArray([], config)

    expect(engine.getAllSheetsDimensions()).toEqual({'Arkusz1': {'height': 0, 'width': 0}})
  })

[wojciechczerniak]

Done in #260