Clean build and translation tools

Makefile

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+version = $(shell cat VERSION)
+excludefromxpi = .git/\* .tx/\* \*.xpi \*.sh update\*.txt Makefile VERSION
+releasebranch = ec-4.0
+
+# Default target is build package
+build:
+	# Update version number inside install.rdf file from VERSION file
+	sed -i 's/\(\s*\)<em:version>[^<]*\?<\/em:version>/\1<em:version>$(version)<\/em:version>/' install.rdf
+	# Disable automatic updates of the extension
+	cat defaults/preferences/update_disable.txt > defaults/preferences/update.js
+	# Finally, create the xpi file
+	zip -r exchangecalendar-v"$(version)".xpi -x $(excludefromxpi) -- . 
+
+# Target to publish a new release:
+release: l10n-auto-commit build
+	git add -- install.rdf
+	git commit -m "releases v$(version)"
+	git tag "v$(version)"
+	@echo 'Translations updated, build done, tag added.'
+	@echo 'Now, if the release is well done, please run one "git push" to publish code and one "git push v$(version)" to publish the new tag.'
+
+# Targets to update translations
+# Requires an already configured Transifex client: https://docs.transifex.com/client/introduction
+# This project has a .tx/ directory which references currently known localisation files
+
+# Get translations updates from Transifex
+l10n-get:
+	git checkout $(releasebranch)
+	tx pull -a
+
+l10n-auto-commit: l10n-get
+	git add -- locale interfaces/exchangeAddressBook/locale/
+	-git commit -m 'l10n: automatic translations updates'
+
+# Send new texts to translate to Transifex
+l10n-push:
+	git checkout $(releasebranch)
+	tx push
+
+# Target to beautify and build your code while developing it
+dev: beautify build
+
+# Beautifier are configured to use indentation with 4 spaces
+beautify: beautify-xml beautify-js
+
+beautify-xml:
+	find \( -name "*.xml" -o -name "*.rdf" -o -name "*.xul" \) -exec \
+		tidy --input-xml yes --indent auto --indent-spaces 4 --indent-attributes yes \
+		--preserve-entities yes --quote-ampersand no --quote-nbsp no --output-xml yes \
+		--strict-tags-attributes no --write-back yes \
+		 {} \;
+beautify-js:
+	find -name "*.js" -exec \
+		js-beautify --indent-size=4 --indent-char=' ' --jslint-happy \
+		--operator-position after-newline --brace-style end-expand --replace \
+		{} \;

VERSION

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+4.0.0-beta5