If a moderator sees the details of a post with a code tag, the word CODE is displayed instead of the translated word (if he or she doesn't use English as board language).
For example, in Brazilian Portuguese, Code is translated by Código. In viewtopic.php or MCP topic, he or she sees Código. But in MCP post details, it become CODE (see the attached prosilver screenshot).
The translation of QUOTE is also missing in post details. That lack doesn't appear with prosilver but other board style can use it (just like CODE). In Brazilian Portuguese, one should read Citação instead of QUOTE (for quotations author).
Therefore, the language strings L_CODE and L_QUOTE should be defined in the post details.
EDIT: the same bug appears in members' profiles (memberlist.php), if the member adds a code or quote in his or her signature.