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

CHANGELOG.md

@@ -1,5 +1,19 @@
 # Freifunk München Firmware Changelog
 
+## v2018.1
+ - Updated to Gluon v2018.1
+   - Changes:
+     - https://gluon.readthedocs.io/en/v2016.2.7/releases/v2017.1.html
+     - https://gluon.readthedocs.io/en/v2016.2.7/releases/v2017.1.1.html
+     - https://gluon.readthedocs.io/en/v2016.2.7/releases/v2017.1.2.html
+     - https://gluon.readthedocs.io/en/v2016.2.7/releases/v2017.1.3.html
+     - https://gluon.readthedocs.io/en/v2016.2.7/releases/v2017.1.4.html
+     - https://gluon.readthedocs.io/en/v2016.2.7/releases/v2017.1.5.html
+     - https://gluon.readthedocs.io/en/v2016.2.7/releases/v2017.1.6.html
+     - https://gluon.readthedocs.io/en/v2016.2.7/releases/v2017.1.7.html
+     - https://gluon.readthedocs.io/en/v2016.2.7/releases/v2017.1.8.html
+     - https://gluon.readthedocs.io/en/v2016.2.7/releases/v2018.1.html
+
 ## v2017.1
 
  - Updated to Gluon v2016.2.7