ベリトランス、ペイジェントで使用している関数をSmartyのmodifier に追加

[ji-eunsoo]

see #911 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.08%. Comparing base (f52f6e2) to head (2464f89).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1186      +/-   ##
==========================================
+ Coverage   50.07%   50.08%   +0.01%     
==========================================
  Files          82       82              
  Lines       10583    10586       +3     
==========================================
+ Hits         5299     5302       +3     
  Misses       5284     5284              

Flag	Coverage Δ
tests	50.08% <100.00%> (+0.01%)	⬆️

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