[modules] Enable translations on some Python modules

- Python modules should have human-readable names, which
   means that the description should be translated in `pretty_name()`

src/modules/machineid/main.py

@@ -6,6 +6,7 @@
 #   Copyright 2014, Kevin Kofler <kevin.kofler@chello.at>
 #   Copyright 2016, Philip Müller <philm@manjaro.org>
 #   Copyright 2017, Alf Gaida <agaida@siduction.org>
+#   Copyright 2019, Adriaan de Groot <groot@kde.org>
 #
 #   Calamares is free software: you can redistribute it and/or modify
 #   it under the terms of the GNU General Public License as published by

src/modules/plymouthcfg/main.py

@@ -6,6 +6,7 @@
 #   Copyright 2016, Artoo <artoo@manjaro.org>
 #   Copyright 2017, Alf Gaida <agaida@siduction.org>
 #   Copyright 2018, Gabriel Craciunescu <crazy@frugalware.org>
+#   Copyright 2019, Adriaan de Groot <groot@kde.org>
 #
 #   Calamares is free software: you can redistribute it and/or modify
 #   it under the terms of the GNU General Public License as published by
@@ -24,6 +25,16 @@ import libcalamares
 
 from libcalamares.utils import debug, target_env_call
 
+import gettext
+_ = gettext.translation("calamares-python",
+                        localedir=libcalamares.utils.gettext_path(),
+                        languages=libcalamares.utils.gettext_languages(),
+                        fallback=True).gettext
+
+
+def pretty_name():
+    return _("Configure Plymouth theme")
+
 
 class PlymouthController:
 

src/modules/removeuser/main.py

@@ -5,6 +5,7 @@
 #
 #   Copyright 2015, Teo Mrnjavac <teo@kde.org>
 #   Copyright 2017. Alf Gaida <agaida@siduction.org>
+#   Copyright 2019, Adriaan de Groot <groot@kde.org>
 #
 #   Calamares is free software: you can redistribute it and/or modify
 #   it under the terms of the GNU General Public License as published by
@@ -22,6 +23,16 @@
 import subprocess
 import libcalamares
 
+import gettext
+_ = gettext.translation("calamares-python",
+                        localedir=libcalamares.utils.gettext_path(),
+                        languages=libcalamares.utils.gettext_languages(),
+                        fallback=True).gettext
+
+
+def pretty_name():
+    return _("Remove live user from target system")
+
 
 def run():
     """