* add help and additional consistency checks
* ignore empty lines

* usage after changing translations via i18n controller /Admin/I18n: "devops/i18n-merge.sh data/i18n/languages/de.ini local/languages/de.ini"
* add minified local/languages/de.ini
* corrects German typo for errorcode_member_not_found in local

* output:
** remove duplicate token "Email " with obsolete value  "E-Mail" by  "Mailen".
** remove duplicate token "Print " with obsolete value  Druck by  "Drucken".
** remove duplicate token "bookbag_email_selected " with obsolete value  "E-Mail" by  "Links zu ausgewählten Medien per E-Mail versenden".
** remove duplicate token "Skip_navigation_links " with obsolete value  "Sprunglinks zum Inhalt" by  "Sprunglinks zur Suche und zum Inhalt".
** replace token "errorcode_member_not_found " with old value  "Die Benutzernummer exisitiert nicht" by new value  "Der aufgerufene Titel (%%id%%) ist nicht vorhanden."

* minify local en.ini
* usage "devops/i18n-merge.sh data/i18n/languages/en.ini local/languages/en.ini"
** remove duplicate token "DBIS " with obsolete value  DBIS by  DBIS.
** remove duplicate token "Skip_navigation_links " with obsolete value  "Skip navigation links" by  "Skip navigation links".