diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 47c6031..ffb92c4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -23,8 +23,8 @@ test:
     paths:
       - node_modules
   script:
-    - make deps-install
-    - make test
+    - npm install
+    - npm run test
 
 build:
   stage: build
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 78b8712..4c85dd1 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -15,6 +15,7 @@ You're welcome to contribute to the [code](#contributing-to-the-code) or to the
 	- [Coding style](#coding-style)
 	- [Copyright notice](#copyright-notice)
 	- [Themes and unit tests](#themes-and-unit-tests)
+	- [Localized strings](#localized-strings)
 - [Contributing to the translations](#contributing-to-the-translations)
 
 ---
@@ -24,23 +25,11 @@ You're welcome to contribute to the [code](#contributing-to-the-code) or to the
 You'll need `make` and [NPM](https://www.npmjs.com/) to install the development dependencies:
 
 ```bash
-make deps-install
+npm install --save-dev
 ```
 
 Create a new branch describing what your're working on, for example `feature/{name-of-the-feature}` or `theme/{name-of-the-theme}`.
 
-To make sure your code passes basic checks, run:
-
-```bash
-make test
-```
-
-If you modify localized strings, make your changed available for translation:
-
-```bash
-make pot
-```
-
 When you're done, commit all your changes and create a new merge request. Choose the appropriate merge request template.
 
 ### Coding style
@@ -50,13 +39,19 @@ We follow the [GNOME Shell coding style](https://gitlab.gnome.org/GNOME/gnome-sh
 To make sure your code follows it:
 
 ```bash
-make test-lint
+npm run test-lint
 ```
 
 ### Copyright notice
 
 If you make changes to a file, please your copyright notice to the top of the file, or in a separate file (named `original-file.ext.license`), following the [SPDX specification](https://spdx.dev/).
 
+Run [`reuse`](https://reuse.software/) to check that all the needed information is present:
+
+```bash
+reuse lint
+```
+
 ### Themes and unit tests
 
 If you add support for a theme, please write a unit test for each of its variants, in the `tests` directory, with the theme name as filename. Unit tests are written for [AVA](https://github.com/avajs/ava).
@@ -64,7 +59,15 @@ If you add support for a theme, please write a unit test for each of its variant
 To run the tests:
 
 ```bash
-make test-variants
+npm run test-variants
+```
+
+### Localized strings
+
+If you modify localized strings, make your changes available for translation:
+
+```bash
+make pot
 ```
 
 ## Contributing to the translations
diff --git a/Makefile b/Makefile
index b2e7cec..f97712b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,6 @@
 # SPDX-FileCopyrightText: 2019-2021 Romain Vigier <contact AT romainvigier.fr>
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-COPYRIGHT_YEAR = 2019-2021
-AUTHOR_NAME = Romain Vigier
-AUTHOR_EMAIL =
 
 NAME = $(shell grep '"name"' ./src/metadata.json | sed 's/\s"name":\s"\(.\+\)",\?/\1/')
 UUID = $(shell grep '"uuid"' ./src/metadata.json | sed 's/\s"uuid":\s"\(.\+\)",\?/\1/')
@@ -11,9 +8,10 @@ VERSION = $(shell grep '"version"' ./src/metadata.json | sed 's/\s"version":\s\(
 
 
 .PHONY: build
-build: build-clean
+build:
 	mkdir -p ./build
 	gnome-extensions pack \
+		--force \
 		--extra-source=../LICENSE \
 		--extra-source=./config.js \
 		--extra-source=./utils.js \
@@ -27,70 +25,34 @@ build: build-clean
 		--out-dir=./build \
 		./src
 
-.PHONY: build-clean
+.PHONY: clean
 build-clean:
 	-rm -rf ./build
-	find ./src/ -type f -name "*.ui~" -delete
 
 .PHONY: install
 install: uninstall
-	gnome-extensions install ./build/$(UUID).shell-extension.zip
+	gnome-extensions install --force ./build/$(UUID).shell-extension.zip
 
 .PHONY: uninstall
 uninstall:
 	-gnome-extensions uninstall $(UUID)
 
-.PHONY: clean
-clean: build-clean deps-clean
-
 .PHONY: test
-test: test-lint test-variants
-
-.PHONY: test-lint
-test-lint:
-	npx eslint .
-
-.PHONY: test-variants
-test-variants:
-	cat ./src/modules/GtkVariants.js ./tests/gtk_themes/_variants.js.template > ./tests/gtk_themes/_variants.js
-	cat ./src/modules/ShellVariants.js ./tests/shell_themes/_variants.js.template > ./tests/shell_themes/_variants.js
+test:
+	reuse lint
 	npm run test
 
-.PHONY: deps-install
-deps-install:
-	npm install
-
-.PHONY: deps-clean
-deps-clean:
-	-rm -rf ./node_modules
-
 .PHONY: pot
 pot:
 	mkdir -p ./src/po
 	xgettext \
 		--from-code=UTF-8 \
-		--keyword=_ \
 		--package-name="$(NAME)" \
-		--package-version="$(VERSION)" \
 		--output=./src/po/$(UUID).pot \
 		./src/*.js ./src/**/*.js ./src/schemas/*.xml ./src/preferences/ui/*.ui
-	sed -i '1,4s/SOME DESCRIPTIVE TITLE./$(NAME)/g' ./src/po/$(UUID).pot
-	sed -i '1,4s/YEAR/$(COPYRIGHT_YEAR)/' ./src/po/$(UUID).pot
-	sed -i "1,4s/THE PACKAGE'S COPYRIGHT HOLDER/$(AUTHOR_NAME)/" ./src/po/$(UUID).pot
-	sed -i "1,4s/FIRST AUTHOR/$(AUTHOR_NAME)/" ./src/po/$(UUID).pot
-	sed -i "1,4s/EMAIL@ADDRESS/$(AUTHOR_EMAIL)/" ./src/po/$(UUID).pot
-
-.PHONY: add-po
-add-po:
-ifdef LANGUAGE_CODE
-	msginit --no-translator --input=src/po/$(UUID).pot --output=src/po/$(LANGUAGE_CODE).po --locale=$(LANGUAGE_CODE)
-else
-	@echo "Please specify the code of the language you want to add, for example:"
-	@echo "	make add-po LANGUAGE_CODE=fr"
-endif
 
 .PHONY: update-po
 update-po:
 	for po_file in $(wildcard ./src/po/*.po); do \
-		msgmerge --update --no-fuzzy-matching --backup=none $$po_file src/po/$(UUID).pot; \
+		msgmerge --update $$po_file src/po/$(UUID).pot; \
 	done
diff --git a/package.json b/package.json
index 5692749..9a3bee0 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,10 @@
 	},
 	"license": "GPL-3.0-or-later",
 	"scripts": {
-		"test": "ava"
+		"test-lint": "eslint .",
+		"pretest-variants": "cat ./src/modules/GtkVariants.js ./tests/gtk_themes/_variants.js.template > ./tests/gtk_themes/_variants.js & cat ./src/modules/ShellVariants.js ./tests/shell_themes/_variants.js.template > ./tests/shell_themes/_variants.js",
+		"test-variants": "ava",
+		"test": "npm run test-lint && npm run test-variants"
 	},
 	"devDependencies": {
 		"ava": "^3.13.0",