Integrate translation module @superset-ui/translation

[kristw]

Import @superset-ui/translation module

• Replace calls (in about hundred places) from

import { t } from '../locales';

to

import { t } from '@superset-ui/translation'

Update webpack build config

• Create preamble.js which defines the steps that has to happen before everything else (e.g. configure the translation module)
• Prepend all webpack entry points with preamble.
• Deprecate common entry point and create a new entry point preamble.
• Update FAB template (base.html and basic.html)
  • Remove common entry point from the page that has an entry point (because preamble is now included with all entry points). Prior to this PR, Superset imports both common and another entry point (explore, dashboard, etc.) in a single page. With this PR, it will no longer import common.
  • Replace common with preamble for the page that doesn't have another entry point. (base.html)
• Extract getClientErrorObject and error message strings into separate files.

@williaster @xtinec @conglei @graceguo-supercat @michellethomas

[codecov-io]

Codecov Report

Merging #6222 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6222      +/-   ##
==========================================
- Coverage   76.87%   76.85%   -0.02%     
==========================================
  Files          47       47              
  Lines        9401     9393       -8     
==========================================
- Hits         7227     7219       -8     
  Misses       2174     2174

Impacted Files	Coverage Δ
superset/utils/dashboard_import_export.py	30.43% <0%> (-10.31%)	⬇️
superset/models/core.py	83.82% <0%> (-0.06%)	⬇️
superset/models/sql_lab.py	98.46% <0%> (-0.05%)	⬇️

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[williaster]

I had one question about bootstrap data but LGTM overall! 💯 🚀