Support serving of backend translations (#12453)

* Add view to support backend translation fetching

* Load backend translations from component json

* Translations for season sensor

* Scripts to merge and unpack Lokalise translations

* Fix copy paste error

* Serve post-lokalise translations to frontend

* Linting

* Auto-deploy translations with Travis

* Commit post-lokalise translation files

* Split logic into more helper functions

* Fall back to English for missing keys

* Move local translation copies to `.translations`

* Linting

* Initial tests

* Remove unnecessary file check

* Convert translation helper to async/await

* Convert translation helper tests to async/await

* Use set subtraction to find missing_components

* load_translation_files use component->file mapping

* Remove duplicated resources fetching

Get to take advantage of the slick Python 3.5 dict merging here.

* Switch to live project ID

script/travis_deploy

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+# Safe bash settings
+# -e            Exit on command fail
+# -u            Exit on unset variable
+# -o pipefail   Exit if piped command has error code
+set -eu -o pipefail
+
+cd "$(dirname "$0")/.."
+
+script/translations_upload