feat(lambda-at-edge, nextjs-commponent): rewrite from root using acce…

[dphang]

…pt-language header, other minor bugfixes for locales

Related: #721

[codecov]

Codecov Report

Merging #885 (9b64587) into master (b4666d3) will decrease coverage by 0.03%.
The diff coverage is 77.39%.

@@            Coverage Diff             @@
##           master     #885      +/-   ##
==========================================
- Coverage   80.41%   80.37%   -0.04%     
==========================================
  Files          63       64       +1     
  Lines        2313     2390      +77     
  Branches      527      547      +20     
==========================================
+ Hits         1860     1921      +61     
- Misses        391      406      +15     
- Partials       62       63       +1     

Impacted Files	Coverage Δ
...rless-components/nextjs-component/src/component.ts	90.79% <0.00%> (-0.57%)	⬇️
...ackages/libs/lambda-at-edge/src/default-handler.ts	91.78% <61.53%> (-3.12%)	⬇️
packages/libs/lambda-at-edge/src/build.ts	89.18% <75.43%> (-0.59%)	⬇️
...ckages/libs/lambda-at-edge/src/routing/rewriter.ts	98.03% <94.11%> (-1.97%)	⬇️
...ages/libs/lambda-at-edge/src/headers/addHeaders.ts	100.00% <100.00%> (ø)
...es/libs/lambda-at-edge/src/routing/common-utils.ts	100.00% <100.00%> (ø)
...ages/libs/lambda-at-edge/src/routing/redirector.ts	78.12% <100.00%> (+0.70%)	⬆️

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