Localization
Nearly all the texts can be modified by a super admin via the System => Localization menu. Either try to find the text which needs to be modified, or the "debug" button can be used and then the page can be checked, and the spell icon can then be clicked to open the Localization page on the correct entry. Note that the localization is done per language. The main (base) language is English, and then a corresponding "English" / "Other" key/value is saved. Only the modified entries are stored, therefore allowing new versions of the system to still improve translations or add new texts.
This localization tool allows to fix typos (before the developers do it officially), change the words used (in some airports other wordings are used) or simply add a custom info to a text.