fix: i18n reference to root causes memory leak (#1044)

[lzxb]

See detail: #1044

[codecov-io]

Codecov Report

Merging #1151 (0534422) into v8.x (fccd7f2) will increase coverage by 0.04%.
The diff coverage is 98.63%.

@@            Coverage Diff             @@
##             v8.x    #1151      +/-   ##
==========================================
+ Coverage   96.38%   96.42%   +0.04%     
==========================================
  Files          10       10              
  Lines         885      924      +39     
==========================================
+ Hits          853      891      +38     
- Misses         32       33       +1     

Impacted Files	Coverage Δ
src/components/interpolation.js	100.00% <ø> (ø)
src/components/number.js	100.00% <ø> (ø)
src/mixin.js	94.44% <95.83%> (-0.30%)	⬇️
src/directive.js	92.98% <100.00%> (ø)
src/index.js	97.83% <100.00%> (+0.08%)	⬆️
src/path.js	88.07% <100.00%> (ø)
src/util.js	98.57% <100.00%> (+0.15%)	⬆️

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[kazupon]

Thanks!
Good job! 👍