Add untranslated strings.

lubuntu/po/ar.po

@@ -2,7 +2,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2018-07-10 08:26+0000\n"
+"POT-Creation-Date: 2018-07-10 02:36-0500\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -11,3 +11,15 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "X-Generator: Translate Toolkit 2.3.0\n"
+
+#: ../calamares.desktop.in.h:1
+msgid "Install Lubuntu 18.10"
+msgstr ""
+
+#: ../calamares.desktop.in.h:2
+msgid "Install Lubuntu"
+msgstr ""
+
+#: ../calamares.desktop.in.h:3
+msgid "Calamares — System Installer"
+msgstr ""