prevent critical hit when unticking a task

Fixes https://github.com/HabitRPG/habitrpg/issues/2356

Currently, when you untick a todo or daily, there's a chance of a critical hit. This prevents that.
fix(drops): Overhaul drops to a percentage multiplier system

WIP. Initial draft of an overhaul to drop chance. Most important bits: (1) A modular system of percentage-based multipliers on the task-value-based initial drop chance. (2) Perception increases the daily drop cap by 1 per 10 points.

Fixes HabitRPG/habitrpg/#1922.
chore(i18n): pull translations from transifex
Updated food items
fix(drops): Increase base value, improve comments
feat(valentine): remove valentine event
fix(items): fix mage ultimate per bonus #2880
chore(i18n): upload Russian locale and update Italian and Polish
fix(i18n): add string and remove old one
fix(pets): Saddle is not edible

Textual tweak for Market and Pets tab
added mysteryItem entries for subscription page
Merge pull request #158 from thepeopleseason/github-habitrpg-2832

Updated subscription text to include Mystery Item monthly perk.
chore(i18n): update challenge wording, fixes #132
Merge pull request #151 from baconsaur/develop

Updated food items
Merge pull request #157 from denis-sokolov/issue-2880

fix(items): fix mage ultimate per bonus #2880
fix(checklists): Improved checklist popover text

Wordy, but clearer and more accurate than the previous help text.

Fixes HabitRPG/habitrpg/#2894
chore(i18n): add swedish and slovak, update other locales
chore(i18n): copy right files for swedish and slovak, was using german and russian files. Update other locales
chore(grunt): grunt with new food images
chore(static): update static links