Rename buttons first and last instead of left/right. Add RTL styles.

This bled into normalizing z-indices for the action menus in the z-index.css. The tooltip id was not unique between action menus for ‘suprise’ and ‘paint’, so `mainTooltipId` was used as a prefix to make them unique.

Enforce this by using `slice` so that no more are ever shown, which would mess up the layout.

Also fixes the issue where the card text could push out when translated into other languages

Currently that’s just hebrew. It’s still available with the `?locale=he` for people to check translations.

It’s being temporarily excluded from the menu until we have RTL support for the interface.

This replaces the event-based search analytics because that method does not allow us to get the advantages of more search-specific analytics.

HT @paulkaplan

* Added localization for ‘Make a Block’
* ‘block name’ default text is in scratch-blocks

The changes in `error-step.jsx` were needed because the same id was defined in there and `unavailable_step.jsx`. The scripts to generate the json file for Transifex give an error if the same id is defined in two places. In error step it simply uses the id without redefining default value etc. The alternative would be to add a new messages.jsx file that has the definitions for shared text and include that in both places that use them.

Goes along with https://github.com/LLK/scratch-blocks/pull/1646

- Make stage look more like a tile element and not flust with the stage info width.
- Make the stage select state more apparent

The onMouseUp handler for the menu rerenders the language menu before the select onChange function runs on Firefox. So it resets the language value back to the previous value and the locale doesn’t update. If the languageMenu isopen don’t fire the openlanguageMenu action.

Eliminate warnings and errors due to library item text (name and desctiption) being localized components instead of simply a string. Some are not localized (e.g. LEGO EV3), so either string or component is possible.

- Resized the next/prev cards and buttons
- Resized the “Remove” and “All Tips” buttons in the nav
- Added hover feedback on next/prev and nav items

In addtion to changing the UI color for “mini cards” from motion blue to extensions aqua, this commit also updates the color variable previously known as ‘$pen-primary’ to ‘$extensions-primary’.