🌐(react) add i18n

We need to be able to use localized texts for various components, like for
accessible labels. We decided to setup a lightweight implementation of
localizable to avoid relying on an existing heavy library.
The Provider includes by default full translations for english, and it is
also made to be able to load easily any custom locale directly from the
Provider.

Makefile

@@ -43,6 +43,7 @@ COMPOSE_RUN          = $(COMPOSE) run --rm --service-ports
 # permission error.
 COMPOSE_RUN_NODE     = $(COMPOSE_RUN) -e HOME="/tmp" node
 YARN                 = $(COMPOSE_RUN_NODE) yarn
+CROWDIN              = $(COMPOSE_RUN) crowdin crowdin
 
 # ==============================================================================
 # RULES
@@ -54,7 +55,9 @@ install: ## install all repos dependencies.
 .PHONY: install
 
 bootstrap: ## install all repos dependencies and build them too.
-bootstrap: build
+bootstrap: \
+	env.d/crowdin \
+	build
 .PHONY: bootstrap
 
 dev: ## watch changes in apps and packages.
@@ -82,6 +85,19 @@ deploy: install
 	@$(YARN) deploy
 .PHONY: deploy
 
+# -- Misc
+env.d/crowdin:
+	cp env.d/crowdin.dist env.d/crowdin
+
+# -- Internationalization
+crowdin-upload:
+	@$(CROWDIN) upload sources -c crowdin/config.yml
+.PHONY: crowdin-upload
+
+crowdin-download:
+	@$(CROWDIN) download -c crowdin/config.yml
+.PHONY: crowdin-download
+
 clean: ## restore repository state as it was freshly cloned
 	git clean -idx
 .PHONY: clean