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

site.conf

@@ -1,5 +1,5 @@
 {
-  hostname_prefix = '',
+  hostname_prefix = 'ffmuc-',
   site_name = 'Freifunk München [ALT]',
   site_code = 'ffmuc',
 
@@ -9,6 +9,10 @@
     },
   },
 
+  -- 32 bytes of random data, encoded in hexadecimal
+  -- This data must be unique among all sites and domains!
+  domain_seed = '8f6cb3915d9cff8e556a88ee9326349b23a251e056465afbd9f5e5c01c86c7c7',
+
   prefix4 = '10.80.32.0/19',
   prefix6 = 'fdef:ffc0:4fff::/64',