[docs] Remove wrong alternate languages

[oliviertassinari]

[mui-pr-bot]

Details of bundle changes.

Comparing: fdc7de2...42d62bf

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	0.00%	0.00%	331,220	331,220	90,473	90,473
@material-ui/core/Paper	0.00%	0.00%	68,774	68,774	20,485	20,485
@material-ui/core/Paper.esm	0.00%	0.00%	62,148	62,148	19,214	19,214
@material-ui/core/Popper	0.00%	0.00%	28,466	28,466	10,188	10,188
@material-ui/core/Textarea	0.00%	0.00%	5,094	5,094	2,135	2,135
@material-ui/core/TrapFocus	0.00%	0.00%	3,834	3,834	1,617	1,617
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	16,385	16,385	5,827	5,827
@material-ui/core/useMediaQuery	0.00%	0.00%	2,541	2,541	1,058	1,058
@material-ui/lab	0.00%	0.00%	153,209	153,209	46,684	46,684
@material-ui/styles	0.00%	0.00%	51,494	51,494	15,304	15,304
@material-ui/system	0.00%	0.00%	15,668	15,668	4,361	4,361
Button	0.00%	0.00%	78,663	78,663	24,048	24,048
Modal	0.00%	0.00%	14,335	14,335	5,013	5,013
Portal	0.00%	0.00%	2,907	2,907	1,322	1,322
Rating	0.00%	0.00%	70,016	70,016	21,864	21,864
Slider	0.00%	0.00%	74,282	74,282	23,015	23,015
colorManipulator	0.00%	0.00%	3,904	3,904	1,543	1,543
docs.landing	0.00%	0.00%	52,253	52,253	13,780	13,780
docs.main	0.00%	-0.00%	597,376	597,376	190,811	190,809
packages/material-ui/build/umd/material-ui.production.min.js	0.00%	0.00%	302,086	302,086	86,797	86,797

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