Merged DMPRoadmap V2.1.3

Changed date format of footer in the Plans pdf export to a more human readable date, ...

e.g., "Last modified 26 April 2019".

Changes:
  - added :readable date format to language locales
  - used this date for the footer in the Plans pdf export.
    Note, changed " formats" to "format" and use :readable in footer date
     From  "date: l(@plan.updated_at.to_date, formats: :short)" -->
     to    "date: l(@plan.updated_at.to_date, format: :readable)"
  - to pass Rspec test spec/features/plans/exports_spec.rb we needed to add
    a locale file en.yml  which is a copy of en-GB.yml to avoid error
    "1) PlansExports User downloads their plan as PDF
     Failure/Error: date: l(@plan.updated_at.to_date, format: :readable)

     I18n::MissingTranslationData:
       translation missing: en.date.formats.readable"

Fix for Issue #2094.

Static pages edition integration

Fixes on static pages locales filename

Merged with DMPRoadmap:master

Update CSV downloads with consistent date format ...

Fixes #1936

Added I18n formats date.formats.csv to allow for regional customisation

Fix broken tests caused by locale configuration (#1875) ...

* Fix broken tests caused by locale configuration

- Add LocaleSet
- Add LocaleFormatter to force proper string formats
- Rename I18n formats to use hyphen
- Add rake task for updating existing languages on DB
- Fix instances of US english in the templates

* Fix FastGettext initializer loader

* Add Amazon S3 creds for Travis

* Revert "Add Amazon S3 creds for Travis"

This reverts commit 366c1a7.

* Fix Faker localization for rake tasks

Was breaking rake db:seed file

added validation tests (#1868) ...

added validation tests

added fr for I18n failing tests

French version from Pootle & new YML

Add tests for locale setting (#1823) ...

* Add tests for locale setting

- Adds Faker::Language module for testing languages with real-ish data
- Refactors global constants into Language model (See Issue#1696)
- Add specs to test locale change works

* Clean up language files to remove long names

* Add DB check in FastGettext initializer

* Set Memory cache for temporary caching solution

* Fix bug in Plan Rule

New YML files & added cookies banner

Merge branch 'dmpopidor_branding' into master

added missing translation markup (#1633) ...

added missing fr_FR and pt_BR gem filkes and updated identifiers

HTML fix in static pages yml

Added `rake translatable:find` ...

ran gettext:find and fixed up en_US translations

added translatable:find task and fixed up a few files

added exception to po/pot backup files in gitignore

began fixing up pt_BR

added pt_BR translations

fixed issue with multiline translatable text on help page. reran translatable:find and fixed up app.pot, pt_BR, en_US and en_GB

fixed test

fixed another test

updated author comments

added devise and bootstrap translations for pt_BR

Merge pull request #1591 from CDLUC3/fix-welcome ...

Fix bug in welcome page