l10n: Change to a capital letter

[Valdnet]

This is the name of the application.
Spelling unification in Transifex.

[codecov]

Codecov Report

Merging #2305 (488ab33) into master (0041bcd) will not change coverage.
The diff coverage is n/a.

❗ Current head 488ab33 differs from pull request most recent head 2e1370a. Consider uploading reports for the commit 2e1370a to get more accurate results

@@            Coverage Diff            @@
##             master    #2305   +/-   ##
=========================================
  Coverage     69.55%   69.55%           
  Complexity      238      238           
=========================================
  Files            22       22           
  Lines           680      680           
=========================================
  Hits            473      473           
  Misses          207      207           

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