diff --git a/openlp/core/ui/thememanager.py b/openlp/core/ui/thememanager.py
index fdf87e528..8ad74975f 100644
--- a/openlp/core/ui/thememanager.py
+++ b/openlp/core/ui/thememanager.py
@@ -760,8 +760,8 @@ class ThemeManager(OpenLPMixin, RegistryMixin, QtWidgets.QWidget, Ui_ThemeManage
                     used_count = plugin.uses_theme(theme)
                     if used_count:
                         plugin_usage = "%s%s" % (plugin_usage, (translate('OpenLP.ThemeManager',
-                                                                          '%s time(s) by %s') %
-                                                                (used_count, plugin.name)))
+                                                                          '%(count)s time(s) by %(plugin)s') %
+                                                                {'count': used_count, 'plugin': plugin.name}))
                         plugin_usage = "%s\n" % plugin_usage
                 if plugin_usage:
                     critical_error_message_box(translate('OpenLP.ThemeManager', 'Unable to delete theme'),
diff --git a/openlp/plugins/songs/lib/importers/wordsofworship.py b/openlp/plugins/songs/lib/importers/wordsofworship.py
index 8b87ee214..4c718162a 100644
--- a/openlp/plugins/songs/lib/importers/wordsofworship.py
+++ b/openlp/plugins/songs/lib/importers/wordsofworship.py
@@ -107,9 +107,9 @@ class WordsOfWorshipImport(SongImport):
                 song_data = open(source, 'rb')
                 if song_data.read(19).decode() != 'WoW File\nSong Words':
                     self.log_error(source,
-                                   str(translate('SongsPlugin.WordsofWorshipSongImport',
-                                                 'Invalid Words of Worship song file. Missing "%s" header.'
-                                                 % 'WoW File\\nSong Words')))
+                                   translate('SongsPlugin.WordsofWorshipSongImport',
+                                             'Invalid Words of Worship song file. Missing "%s" header.')
+                                   % 'WoW File\\nSong Words')
                     continue
                 # Seek to byte which stores number of blocks in the song
                 song_data.seek(56)
@@ -117,9 +117,9 @@ class WordsOfWorshipImport(SongImport):
                 song_data.seek(66)
                 if song_data.read(16).decode() != 'CSongDoc::CBlock':
                     self.log_error(source,
-                                   str(translate('SongsPlugin.WordsofWorshipSongImport',
-                                                 'Invalid Words of Worship song file. Missing "%s" '
-                                                 'string.' % 'CSongDoc::CBlock')))
+                                  translate('SongsPlugin.WordsofWorshipSongImport',
+                                            'Invalid Words of Worship song file. Missing "%s" string.')
+                                  % 'CSongDoc::CBlock')
                     continue
                 # Seek to the beginning of the first block
                 song_data.seek(82)