Kitchen count dish ingredients - show when they change

[lamontfr]

Fixes #747.

Changes proposed in this pull request:

• delivery/forms.py : add class to uniquely identify dropdowns in frontend logic.
• delivery/templates/ingredients.html : add update ingredients button and logic to enable / disable buttons.
• delivery/views.py : add logic to detect main dish ingredients changes VS recipe, clear all day's ingredients when changing dish, separate update ingredients and next step logic, kitchen count step verifies prerequisites.
• frontend/js/delivery.js : add logic to enable / disable button when UI dropdowns are modified.

Status

• [X] READY

How to verify this change

• Click on Kitchen count
• Generate orders for the day
• Click I'm ready to go to step 2 ingredients
• Select a different main dish
• The Restore button is disabled
• The Confirm all ingredients button is enabled
• The Next button is disabled
• Add two sides ingredients
• Click Update all ingredients
• The Next button is enabled : click it to go to step 3
• Verify Kitchen count main dish and its ingredients

• ---

• Go back to step 2 Ingredients
• Add main dish ingredients(s)
• The Restore button is enabled
• The Confirm all ingredients button is enabled
• The Next button is disabled
• Click Update all ingredients
• The Confirm all ingredients button is disabled
• The Next button is enabled : click it to go to step 3
• Verify Kitchen count main dish and its ingredients

• ---

• Go back to step 2 Ingredients
• The Restore button is enabled
• Click Restore
• The Restore button is disabled
• The Confirm all ingredients button is enabled
• The Next button is disabled
• Click Update all ingredients
• The Confirm all ingredients button is disabled
• The Next button is enabled : click it to go to step 3
• Verify Kitchen count main dish and its ingredients

• ---

• Go back to step 2 Ingredients
• The Confirm all ingredients button is disabled
• Change side dish ingredient(s)
• The Confirm all ingredients button is enabled
• The Next button is disabled
• Click Update all ingredients
• The Confirm all ingredients button is disabled
• The Next button is enabled : click it to go to step 3
• Verify Kitchen count main dish and its ingredients

New translatable strings

• [X] If applicable, I have included updated .po files with new strings

[coveralls]

Coverage increased (+0.02%) to 95.362% when pulling 8b840bae79f2ae9f5164c969ee6c9cab1cdb6930 on lamontfr:fix747 into a7c706878c1ea1ecee9164444686e8e811686c13 on savoirfairelinux:dev.

[coveralls]

Coverage increased (+0.08%) to 95.42% when pulling 3843c1c1d9f83f7193c2e6324a30f6f9e7239091 on lamontfr:fix747 into a7c706878c1ea1ecee9164444686e8e811686c13 on savoirfairelinux:dev.

[lamontfr]

@lingxiaoyang I followed your wise suggestion and made the changes to improve UI consistency. Thanks !

[lingxiaoyang]

@lamontfr Thank you! I'm merging now.