update to v2018.1 (see details)

- update CHANGELOG.md
- updated translations (de, en)
- added french translation (just copied. Please review)
- update site.mk
  - gluon now provides a GLUON_FEATURES where all packages get
    prepended with "gluon-" automatically. This is now used
  - use GLUON_FEATURE web-wizard

i18n/gluon-site.pot

@@ -0,0 +1,38 @@
+msgid ""
+msgstr "Content-Type: text/plain; charset=UTF-8"
+
+msgid "gluon-config-mode:welcome"
+msgstr ""
+
+msgid "gluon-config-mode:domain"
+msgstr ""
+
+msgid "gluon-config-mode:domain-select"
+msgstr ""
+
+msgid "gluon-config-mode:pubkey"
+msgstr ""
+
+msgid "gluon-config-mode:novpn"
+msgstr ""
+
+msgid "gluon-config-mode:reboot"
+msgstr ""
+
+msgid "gluon-config-mode:altitude-label"
+msgstr ""
+
+msgid "gluon-config-mode:altitude-help"
+msgstr ""
+
+msgid "gluon-config-mode:contact-help"
+msgstr ""
+
+msgid "gluon-config-mode:contact-note"
+msgstr ""
+
+msgid "gluon-config-mode:hostname-help"
+msgstr ""
+
+msgid "gluon-config-mode:geo-location-help"
+msgstr ""