diff --git a/.flake8 b/.flake8
index 35abd39..9656ec8 100644
--- a/.flake8
+++ b/.flake8
@@ -1,6 +1,7 @@
 [flake8]
 builtins = _
 max-line-length = 100
+show-source = true
 
 # Temporary
 exclude = src/diffuse/main.py
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5abdfa8..1be2757 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -22,10 +22,10 @@ jobs:
     - run: pip install -r requirements.txt
 
     - name: Flake8
-      run: flake8 src/
+      run: flake8 src/ po/
 
     - name: MyPy
-      run: mypy src/
+      run: mypy src/ po/
 
   meson-build-test:
     runs-on: ubuntu-latest
diff --git a/po/update-translations.py b/po/update-translations.py
index 235a1e5..306c20a 100755
--- a/po/update-translations.py
+++ b/po/update-translations.py
@@ -20,17 +20,18 @@
 # 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 import argparse
-import glob
 import os
 import subprocess
 import shutil
 import tempfile
 
+
 def check_translation(filename):
-    subprocess.run(["msgfmt", "-c", "-v", filename])
+    subprocess.run(['msgfmt', '-c', '-v', filename])
+
 
 def update_translation(filename):
-    print(f"Updating translation file '{filename}'...")
+    print(f'Updating translation file "{filename}"...')
 
     # Get language
     lang = os.path.splitext(filename)[0]
@@ -40,17 +41,34 @@ def update_translation(filename):
     shutil.move(filename, tmpfile)
 
     # Create a new .po file for this language
-    emptypofile = os.path.join(tmpdir, f"{lang}.empty.po")
-    subprocess.run(["msginit", "--no-wrap", "--no-translator", "-l", lang, "-o", emptypofile, "-i", "diffuse.pot"])
+    emptypofile = os.path.join(tmpdir, f'{lang}.empty.po')
+    subprocess.run([
+        'msginit',
+        '--no-wrap',
+        '--no-translator',
+        '-l',
+        lang,
+        '-o',
+        emptypofile,
+        '-i',
+        'diffuse.pot'])
 
     # Merge with the old translation
-    subprocess.run(["msgmerge", "-q", "--no-wrap", tmpfile, emptypofile, "-o", filename])
+    subprocess.run([
+        'msgmerge',
+        '-q',
+        '--no-wrap',
+        tmpfile,
+        emptypofile,
+        '-o',
+        filename])
 
     # Validate translation
-    print(f"Validate {filename}:")
+    print(f'Validate "{filename}":')
     check_translation(filename)
 
-    print(f"Update done.")
+    print('Update done.')
+
 
 # Setup argument parser
 parser = argparse.ArgumentParser(description='Update translation files (.po).')
@@ -68,7 +86,7 @@ po_files.sort()
 
 if args.check_only:
     for file in po_files:
-        print(f"Validate {file}:")
+        print(f'Validate "{file}":')
         check_translation(file)
     exit(0)