Reverting translations fails

[frosch123]

OpenTTD/OpenTTD#10058 made a change in the base language:

-STR_AI_SETTINGS_CAPTION_AI                                      :AI
+STR_AI_SETTINGS_CAPTION_AI                                      :{WHITE}AI Parameters

A few months later OpenTTD/OpenTTD#10446 reverted that change:

-STR_AI_SETTINGS_CAPTION_AI                                      :{WHITE}AI Parameters
+STR_AI_SETTINGS_CAPTION_AI                                      :AI

Translators tried to follow this change:

• Updating the translation from "AI" to "{WHITE}AI Parameters" worked.
• Updating the translation from "{WHITE}AI Parameters" back to "AI" is discarded by Eints. Probably because it matches an older translation.

Known work-around:

• Changing the translation to some "foobar" as an intermediate translation, so that "AI" becomes the previous-previous translation instead of the previous one, allows retranslating the string to "AI" again.