* feat(aria): Add aria-labels to underlabelled tab nav items
The drawer tabs which control primary navigation are only labelled by a title which is not available to many screenreaders. Add an aria-label attribute to each link to improve readability with screenreaders. Organize link attributes so link target is first followed by classname.
Issue #1349
* feat(aria): Replace abstract aria role of section with region
Abstract aria roles such as section should not be used in content. Use non-abstract 'region' aria role instead. That role expects an aria-labelledby attribute with an id. Pass an ID to the column header. Remove the aria-label attribute on the ColumnHeader because the same value is output in plaintext as its child.
Issue #1349
* fix(aria): Remove aria-controls attribute until solution is found
Columns do not have wrappers, so these icons can't point to a column wrapper which it controls. Instead these icons function as triggers to show or hide individual columns.
#1349
* fix(typo): Remove type of aria-labelledby instead of aria-label
* Reorder javascript English locale file
* Reorder translation string in order of the locale key.
* Add javascript English locale missing language keys
* Search all javascript language keys by command:
`grep -REho '<FormattedMessage .*\/>' ./app/assets/javascripts/.`
* Add all the missing language keys and their values to `en.jsx`.
* Add javascript English locale missing language keys (2)
* Find all `defineMessages` calls with this command:
`grep -Rl 'defineMessages({.*' ./app/assets/javascripts/.`
* Open all these files. Find the language key (`id`) in these
statements.
* Add all the missing language keys and their values to `en.jsx`.
* Remove javascript English locale obsoleted language keys
* Find all language keys that no longer exists in the source code
and remove them. The removed keys include:
* "compose_form.private"
* "compose_form.unlisted"
* "getting_started.about_addressing"
* "getting_started.about_shortcuts"
* "notification.mention"
* "search.account"
* "search.hashtag"
* "tabs_bar.mentions"
* "tabs_bar.public"
* Javascript English locale file add note
* Add notes to contributors about the English translation files.
Hope that will make translation process smoother.
* Update javascript locale defaultValue in code
* Update the defaultValue in code according to the relevant
translation in English locale file.
