- Add localization machinery including an official German translation (locale `de`) [#2195, #2207, #2210, #2232, #2217]

- Add `violin` trace type [#2116]

- Add `selected` and `unselected` attribute containers to customize selection states [#2135]

- Add support for multi-selections [#2140]

- Add layout `colorway` to custom the trace-to-trace color sequence [#2156]

- Add `tickformatstops` to set tick format per cartesian axis range [#1965]

- Add hover labels and selections to box points [#2094]

- Histogram events & bin hover label improvements [#2113]

- Add support for aggregation in `pie` traces [#2117]

- Add annotations `startarrowhead`, `arrowside`, `startarrowsize` and `startstandoff` attributes [#2164]

- Add `zhoverformat` to format `z` values in `heatmap`, `contour` and 2d histogram traces [#2106, #2127]

- Add `marker.opacity` to bar traces [#2163]

- Add `Cividis` colorscale [#2178]

- Implement transform inverse mapping [#2126, #2162]

- Selections are now persistent [#2135]

- Make subplot initialization and removal more robust and consistent [#2227]

- Share WebGL context between `gl2d` and `parcoords` subplots [#2159, #2238]

- Rename _Save and edit plot in cloud_ mode bar button _Edit in Chart Studio_ [#2183]

- Minify bundles using `minify-stream` instead of UglifyJS2 [#2187]

- Update header for new year 2018 [#2231]

- Remove `type="text/javascript"` from `<script>` tags present in our docs and test utilities [#2217]

- Fix right-click handling [#2241]

- Miscellaneous fixes for `table` traces [#2107, #2182]

- Fix horizontal legend items alignment edge case [#2149]

- Fix shape and updatemenu layering [#2121]

- Fix bar with error bar with set `ids` edge case [#2169]

- Fix `cliponaxis: false` for non linear cartesian axes [#2177]

- Fix heatmap non-uniform brick gaps problem [#2213]

- Fix choropleth selection when `visible: false` trace are present on graph [#2099, #2109]

- Fix yet another contour drawing bug [#2091]

- Clean up pie event data [#2117]

- Fix scatter + bar hover edge cases [#2218]

- Allow hover labels to extend to edges of graph area [#2215]

- Harden location-to-feature against non-string country names for geo subplot [#2122]

- Remove obsolete `smith` attribute from plot schema [#2093]

- Fix colorbar class name [#2139]

- Make `Plotly.Plots.resize` accept graph ids (as well as graph divs) [#2212]