diff --git a/c3l_membership/forms.py b/c3l_membership/forms.py
--- a/c3l_membership/forms.py
+++ b/c3l_membership/forms.py
@@ -1,5 +1,6 @@
 from datetime import date
 
+from flask_babel import lazy_gettext
 from flask_wtf import FlaskForm
 from wtforms import BooleanField, DateField, RadioField, StringField, SubmitField
 from wtforms.validators import Email, InputRequired, Length, Optional
@@ -8,84 +9,96 @@ from wtforms.validators import Email, In
 class MembershipForm(FlaskForm):
 
     username = StringField(
-        "Username",
-        validators=[InputRequired("This field is required!"), Length(max=255)],
+        lazy_gettext("Username"),
+        validators=[
+            InputRequired(lazy_gettext("This field is required!")),
+            Length(max=255),
+        ],
     )
     email = StringField(
-        "E-Mail", validators=[InputRequired("This field is required!"), Email()]
+        lazy_gettext("E-Mail"),
+        validators=[InputRequired(lazy_gettext("This field is required!")), Email()],
     )
     fullname = StringField(
-        "Full Name",
-        validators=[InputRequired("This field is required!"), Length(max=65536)],
+        lazy_gettext("Full Name"),
+        validators=[
+            InputRequired(lazy_gettext("This field is required!")),
+            Length(max=65536),
+        ],
     )
 
     membership = RadioField(
-        "Membership Plan",
-        validators=[InputRequired("Please select one of the options!")],
+        lazy_gettext("Membership Plan"),
+        validators=[InputRequired(lazy_gettext("Please select one of the options!"))],
         choices=[
             (
                 "regular",
-                "Regular membership - Membership with voting rights on the general assembly.",
+                lazy_gettext(
+                    "Regular membership - Membership with voting rights on the general assembly."
+                ),
             ),
             (
                 "supporting",
-                "Supporting membership - Membership without voting rights on the general assembly.",
+                lazy_gettext(
+                    "Supporting membership - Membership without voting rights on the general assembly."
+                ),
             ),
         ],
     )
 
     student = BooleanField(
-        ("I am a student and would like to have the reduced membership fees."),
+        lazy_gettext(
+            "I am a student and would like to have the reduced membership fees."
+        ),
     )
 
     starving = BooleanField(
-        (
+        lazy_gettext(
             "I am a starving hacker and cannot afford the membership! (Please get in touch with us at info@c3l.lu before filling out this membership form)"
         )
     )
 
     payment = RadioField(
-        "Payment Options",
-        validators=[InputRequired("Please select one of the options!")],
+        lazy_gettext("Payment Options"),
+        validators=[InputRequired(lazy_gettext("Please select one of the options!"))],
     )
 
-    birthday = DateField("Birthday")
+    birthday = DateField(lazy_gettext("Birthday"))
 
     street = StringField(
-        "Nr., Street",
+        lazy_gettext("Nr., Street"),
         validators=[Length(max=4000)],
     )
     zip = StringField(
-        "Postal Code",
+        lazy_gettext("Postal Code"),
         validators=[Length(max=30)],
     )
 
     city = StringField(
-        "City/Town",
+        lazy_gettext("City/Town"),
         validators=[Length(max=500)],
     )
 
     state = StringField(
-        "State/County/Province",
+        lazy_gettext("State/County/Province"),
         validators=[Length(max=500)],
     )
 
     country = StringField(
-        "Country",
+        lazy_gettext("Country"),
         validators=[Length(max=500)],
     )
 
     terms = BooleanField(
-        (
-            "By submitting this membership application, you agree to have read and understood "
-            'the <a href="http://statutes.c3l.lu">statutes of the Chaos Computer Club Lëtzebuerg A.S.B.L.</a>'
+        lazy_gettext(
+            'By submitting this membership application, you agree to have read and understood the <a href="http://statutes.c3l.lu">statutes of the Chaos Computer Club Lëtzebuerg A.S.B.L.</a>.'
         ),
         validators=[InputRequired()],
     )
 
     minor_member = BooleanField(
-        (
+        lazy_gettext(
             "I am under 18 years of age and have the approval of my legal representative."
-        ),
+        )
     )
-    submit = SubmitField("Become a member")
+    submit = SubmitField(lazy_gettext("Become a member"))