add `Plotly.setPlotConfig` step in plotly.js-locales README
add `Plotly.setPlotConfig` step in plotly.js-locales README

aburato/plotly.js,plotly/plotly.js,plotly/plotly.js,aburato/plotly.js,etpinard/plotly.js,etpinard/plotly.js,plotly/plotly.js,asolagmbh/plotly.js,asolagmbh/plotly.js,plotly/plotly.js,etpinard/plotly.js,asolagmbh/plotly.js