Merge pull request mozilla#2415 from ckprice/remove-test-notifications

[fixes mozilla#2408] Remove test notifications

Pontoon: Update Spanish (es-AR) localization of Test Pilot Website

Localization authors:
- deimidis <[email protected]>

Merge pull request mozilla#2388 from ckprice/issue-2381-privacy-link

[fix mozilla#2381] Update Page Shot privacy link

Merge pull request mozilla#2354 from fzzzy/2350-reload-window-on-disc…

…onnect

2350 reload window on disconnect

Pontoon: Update Spanish (es-AR) localization of Test Pilot Website

Localization authors:
- gmontagu <[email protected]>

Merge pull request mozilla#2320 from flodolo/fix_l10n

Stop hashing en-US ftl files in template

Update CONTRIBUTING.md (mozilla#2302)

Delay Containers launch (mozilla#2226)

fix addon handling of launch date and make current push work with bro…

…ken version (mozilla#2228)

add a note about fx 51 requirement