project_form: add translation fuctionality to submit buttons

[jmfrenzel]

Context

As of cc8f6be the bootstrap buttons
rdmo/projects/templates/projects/project_form.html:12 rdmo/projects/templates/projects/project_form.html:17

do not provide translation functionality that can be alternated.

current behavior de locale translation of rdmo/projects/templates/projects/project_form.html:12 is "Ansichten bearbeiten" which is not what a user expects when the action is to save changes to views.

de locale translation of rdmo/projects/templates/projects/project_form.html:17 is "Projekt bearbeiten" which is not what a user expects when the action is to save changes to tasks.

expected behavior

• implement i18n functionality for the buttons
• change de translation of that buttons from "Ansichten bearbeiten" into "Ansichten aktualisieren"
• change de translation of that buttons from "Ansichten bearbeiten" into "Aufgaben aktualisieren"

[triole]

Thanks for reporting. Fixed in https://github.com/rdmorganiser/rdmo/commit/6664f4af18cb99b1539b9d55a5e8b59112b1f08f