Add sync for overrideLang

[irina060981]

For the #170

1. remove the "Using Language" link
2. sync override language checkbox through all lookup components
3. fix styles for checkbox label

[coveralls]

Pull Request Test Coverage Report for Build 1783

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• 242 unchanged lines in 15 files lost coverage.
• Overall coverage decreased (-10.1%) to 43.879%

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Files with Coverage Reduction	New Missed Lines	%
src/lib/options/storage-adapter.js	3	100.0%
src/lib/l10n/message.js	3	100.0%
src/lib/selection/media/html-selector.js	4	3.14%
src/lib/queries/lexical-query-lookup.js	4	100.0%
src/lib/l10n/l10n.js	5	100.0%
src/vue-components/lookup.vue	6	87.25%
src/lib/log/logger.js	6	100.0%
src/lib/options/options-item.js	7	93.44%
src/lib/selection/media/media-selector.js	7	100.0%
src/lib/selection/text-selector.js	9	100.0%

Totals
Change from base Build 1776:	-10.1%
Covered Lines:	551
Relevant Lines:	1246

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💛 - Coveralls

[kirlat]

Looks good to me!

[balmas]

thanks!