Revert "Add another convenience function allowing i18n_noops("foo")+"bar""

Revert "Add another convenience function allowing i18n_noops("foo")+"bar""

Such string-return aliases for i18n functions encourage creation of texts
using concatenation (+). However, such strings might not be translateable
in the future (e.g. into languages with very different word order).

To encourage using i18n_get_string() which is a translation-friendly way
to dynamically assemble strings, we remove this

This reverts commit 0562a0f617437d45d9e344da14980598d7c6c93d.