remove targets whose functions can be deferred to Weblate add-ons

Makefile

@@ -193,7 +193,6 @@ version:
 ##############
 
 LOCALE_DIR=securedrop_client/locale
-LOCALES=$(shell find ${LOCALE_DIR} -name "*.po")
 POT=${LOCALE_DIR}/messages.pot
 SUPPORTED_LOCALES_LIST=l10n.txt
 VERSION=$(shell python -c "import securedrop_client; print(securedrop_client.__version__)")
@@ -208,12 +207,6 @@ check-strings: ## Check that the translation catalog is up to date with source c
 .PHONY: extract-strings
 extract-strings: ## Extract translatable strings from source code
 	@make --always-make ${POT}
-	@for catalog in $$(find ${LOCALE_DIR} -name "*.po"); do make $${catalog}; done
-
-# Compile loadable/packageable MOs.
-.PHONY: compile-translation-catalogs
-compile-translation-catalogs: ${LOCALE_DIR}/*/LC_MESSAGES/messages.mo
-	@for locale in $^; do make $${locale}; done
 
 # Derive POT from sources.
 $(POT): securedrop_client
@@ -233,34 +226,6 @@ $(POT): securedrop_client
 		$^
 	@sed -i -e '/^"POT-Creation-Date/d' ${POT}
 
-# Merge current POT with a locale's PO.
-#
-# NB. freedomofpress/securedrop/securedrop/i18n_tool.py updates via
-# msgmerge even though pybabel.update() is available.  Here we use
-# "pybabel update" for consistency with "pybabel extract".
-${LOCALE_DIR}/%/LC_MESSAGES/messages.po: ${POT}
-ifeq ($(strip $(LOCALES)),)
-	@echo "no translation catalogs to update"
-else
-	@pybabel update \
-		--locale $$(echo $@ | grep -Eio "[a-zA-Z_]+/LC_MESSAGES/messages.po" | sed 's/\/LC_MESSAGES\/messages.po//') \
-		--input-file ${POT} \
-		--output-file $@ \
-		--no-wrap \
-		--previous
-	@sed -i -e '/^"POT-Creation-Date/d' $@
-endif
-
-# Compile a locale's PO to MO for (a) development runtime or (b) packaging.
-${LOCALE_DIR}/%/LC_MESSAGES/messages.mo: ${LOCALE_DIR}/%/LC_MESSAGES/messages.po
-ifeq ($(strip $(LOCALES)),)
-	@echo "no translation catalogs to compile"
-else
-	@pybabel compile \
-		--directory ${LOCALE_DIR} \
-		--statistics
-endif
-
 # List languages 100% translated in Weblate.
 .PHONY: supported-languages
 supported-languages: