apps/budgeting/proposal-item: using internationalized date

[khamui]

No description provided.

[khamui]

i found this build-in way to make dates internationalized (similar to what we have in Django). So i wrapped it into a helper function. and we don't need a third party library for it.

In order to have this working, we need to pass locale information to the frontend. What do you guys think?
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl

PS:
I have to admit the template filters (richtext, intcomma, date etc.) is a cool concept in Django. Don't know why react does not offer these converters.

[github-actions]

Coverage report

Total coverage

Status	Category	Percentage	Covered / Total
🔴	Statements	3.14%	39/1242
🔴	Branches	2.93%	21/716
🔴	Functions	4.15%	17/410
🔴	Lines	6.79%	248/3654

Status of coverage: 🟢 - ok, 🟡 - slightly more than threshold, 🔴 - under the threshold

Show files with reduced coverage 🔻

Reduced coverage

Status	Filename	Statements	Branches	Functions	Lines
🟢	meinberlin/apps/budgeting/assets/BudgetingProposalListItem.jsx	100%	83.33% (-16.67% 🔻)	100%	100%

Status of coverage: 🟢 - ok, 🟡 - slightly more than threshold, 🔴 - under the threshold

Report generated by 🧪jest coverage report action from 164b597

[fuzzylogic2000]

Nice!
It will not have a huge impact in mB, where we force the locale to be German (https://github.com/liqd/admin/blob/a9c81b672cf1863c5f6e256402f96ea734cf8ec2/pillar/servers/berlin-adhocracy4-prod.sls#L119), but it might solve our problems elsewhere!

[sabinammm]

Looks really nice & working perfectly for me:)