Replace intltool usage with xgettext

[TingPing]

Closes #853

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (fd64de6) 67.67% compared to head (517fe44) 67.67%.

❗ Current head 517fe44 differs from pull request most recent head f894668. Consider uploading reports for the commit f894668 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #854   +/-   ##
=======================================
  Coverage   67.67%   67.67%           
=======================================
  Files          10       10           
  Lines        3913     3913           
=======================================
  Hits         2648     2648           
  Misses       1265     1265           

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[jeromerobert]

Not merging as is but kept for the record. See #853 for details.

[jeromerobert]

genpot.sh change merged: 514edb6