Added support for i18n language arrays

[WebFreak001]

Redo of #1869 because that one was on master and I accidentally updated that branch

[s-ludwig]

I was wondering if this couldn't be shortened to something like:

template languageSeq(CTX) {
    static if (is(typeof([CTX.languages]) : string[])) alias languageSeq = CTX.languages;
    else alias languageSeq= aliasSeqOf!(CTX.languages);
}

and then use languageSeq!CTX instead of CTX.languages.

The change itself definitely makes a lot of sense.

[WebFreak001]

Hm yeah, made it use your code there now and validated by compiling the i18n example

[s-ludwig]

Thanks. Failures just look like previous errors that managed to get on master.