Sync with reactjs.org @ 1fe2e0ae#269

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reactjs-translation-bot wants to merge 12 commits intomasterfrom

Commits on Mar 11, 2019

Update languages.yml (#1808)
tesseralis
authored

Commits on Mar 13, 2019

Commits on Mar 14, 2019

Fixing incorrect value for eslint rule (#1824)

manuelbieh
authored and
alexkrolick
committed
Updating useMemo docs (#1796)

DimitarNestorov
authored and
gaearon
committed

Commits on Mar 15, 2019

Fix overflowing headers on small screens (#1830)

nelsonreitz
authored and
gaearon
committed
merging all conflicts
reactjs-translation-bot
committed