Final answer:
The incorrect step is to upload each language in separate files, instead, import a formatted file with separate columns for each translation.
Step-by-step explanation:
The incorrect step in adding both translations to your survey at the same time is to upload each language in its own, in separate Unicode text (Excel) files. The incorrect step is to upload each language in separate files, instead, import a formatted file with separate columns for each translation. Instead, you should import a formatted file with separate columns for each translation.
The incorrect step is to upload each language in separate files, instead, import a formatted file with separate columns for each translation. Enter the name of each language in row 1 of the Unicode text (Excel) file above the corresponding translation and enable both translations from the add language dropdown in the translation editor.