diff --git a/linkcheck/__init__.py b/linkcheck/__init__.py
index 573d6bcf..b342f80a 100644
--- a/linkcheck/__init__.py
+++ b/linkcheck/__init__.py
@@ -74,7 +74,7 @@ def get_link_pat(arg, strict=False):
     @rtype: dict
     @raises: re.error on invalid regular expressions
     """
-    log.debug(LOG_CHECK, "Link pattern %r strict=%s", arg, strict)
+    log.debug(LOG_CHECK, _("Link pattern %r strict=%s"), arg, strict)
     if arg.startswith('!'):
         pattern = arg[1:]
         negate = True
@@ -84,7 +84,7 @@ def get_link_pat(arg, strict=False):
     try:
         regex = re.compile(pattern)
     except re.error as msg:
-        log.warn(LOG_CHECK, "invalid regular expression %r: %s" % (pattern, msg))
+        log.warn(LOG_CHECK, _("invalid regular expression %r: %s"), pattern, msg)
         raise
     return {
         "pattern": regex,
diff --git a/linkcheck/lc_cgi.py b/linkcheck/lc_cgi.py
index 5cc88b66..a3820f16 100644
--- a/linkcheck/lc_cgi.py
+++ b/linkcheck/lc_cgi.py
@@ -212,7 +212,7 @@ def checkform(form, env):
                 locale.setlocale(locale.LC_ALL, localestr)
                 init_i18n()
             except locale.Error as errmsg:
-                log(env, "could not set locale %r: %s" % (localestr, errmsg))
+                log(env, _("could not set locale %r: %s") % (localestr, errmsg))
         else:
             raise LCFormError(_("unsupported language %r") % lang)
     # check url syntax
diff --git a/linkcheck/loader.py b/linkcheck/loader.py
index 02f52ac7..ecf5853e 100644
--- a/linkcheck/loader.py
+++ b/linkcheck/loader.py
@@ -37,7 +37,7 @@ def get_package_modules(packagename, packagepath):
                 name = "..%s.%s" % (packagename, mod.name)
                 yield importlib.import_module(name, __name__)
             except ImportError as msg:
-                print("WARN: could not load module %s: %s" % (mod.name, msg))
+                print(_("WARN: could not load module %s: %s") % (mod.name, msg))
 
 
 def get_folder_modules(folder, parentpackage):
@@ -54,7 +54,7 @@ def get_folder_modules(folder, parentpackage):
             spec.loader.exec_module(module)
             yield module
         except ImportError as msg:
-            print("WARN: could not load file %s: %s" % (fullname, msg))
+            print(_("WARN: could not load file %s: %s") % (fullname, msg))
 
 
 def get_importable_files(folder):
diff --git a/linkcheck/plugins/markdowncheck.py b/linkcheck/plugins/markdowncheck.py
index 7c01f054..0a05415b 100644
--- a/linkcheck/plugins/markdowncheck.py
+++ b/linkcheck/plugins/markdowncheck.py
@@ -85,7 +85,7 @@ class MarkdownCheck(_ContentPlugin):
             try:
                 self.filename_re = re.compile(pattern)
             except re.error as msg:
-                log.warn(LOG_PLUGIN, "Invalid regex pattern %r: %s" % (pattern, msg))
+                log.warn(LOG_PLUGIN, _("Invalid regex pattern %r: %s"), pattern, msg)
 
     @classmethod
     def read_config(cls, configparser):
diff --git a/linkcheck/plugins/regexcheck.py b/linkcheck/plugins/regexcheck.py
index 6b0dc3d6..43ef498b 100644
--- a/linkcheck/plugins/regexcheck.py
+++ b/linkcheck/plugins/regexcheck.py
@@ -42,7 +42,7 @@ class RegexCheck(_ContentPlugin):
             try:
                 self.warningregex = re.compile(pattern)
             except re.error as msg:
-                log.warn(LOG_PLUGIN, "Invalid regex pattern %r: %s" % (pattern, msg))
+                log.warn(LOG_PLUGIN, _("Invalid regex pattern %r: %s"), pattern, msg)
 
     def applies_to(self, url_data):
         """Check for warningregex, extern flag and parseability."""