Remove default arg language in handlers; complete some internationalization of handlers

in this commit:
- removed default arg language in handlers
- added correct language serialization on various handlers
- Import memory variables automagically on relevant transacts
- some handlers rewritten making use of a single wrapping transact in order to obtain atomic queries
Remove a debug print inside migration script
Integrate landscape.io into README.md
Correct undefined variables in validator.py and wrong indentations
Fix main pylint errors thanks to Landscape.io analysis
Minor fix import error bug introduced in previous commit and not spotted by UT
Language selector should be update on node resource update
Remove unused argument passed to function to wb comments post
Add error print in case of failed superagent requests

this commit fix a bug reported by @2langnic while trying to build a custom glclient
Remove outdated and unuseful dumper.py
Reorder package.json dependencies

command used npm install grunt --save-dev
Update jquery version
Delete outdated README.md(s) from old repos
Bump licensing year
Move outdated /docs files to /material (temporary commit before cleaninig and rewriting)
Fix html syntax of form.html

thanks to @2langnic for reporting the bug
Fix CSS syntax of main.css

thanks to @2langnic for reporting the bug
Cleanup of Gruntfile.js and dependency fixing
Update translations
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