core works on language file checker tooling

[AlexanderStohr]

added a basic checker
added sorted files
added checker log
added language files from pull requests

[AlexanderStohr]

@scrumpypoker - i feel this is something that already might be helpful for the existing files and_as_well for upcoming files because they are currently so spread and diverse in content that in the short term a "joint" approach might be needed.

other than that i would propose to rather use sorted files with sorting being based on char-by-char sorting (rather than the bash based "sort" command). the tool already creates a file for each input that shall work as a sort proposal.

this is less of a needed merge but rather a "workplace" (e.g. for people working on translations) and a base for overall discussion.
in mid term it should be helpful to just propagate the checker script itself (and nothing else, not even the log file) to the main branch.

[AlexanderStohr]

workbench = https://github.com/AlexanderStohr/i18n/tree/add_i8n_tooling