My interviews are conducted in French but data reporting will be done in English
You translate it. My interviews were in English but when i came across words which my interviewees could not translate i did it for them and mentioned this in the methodology chapter. Guess it depends on your level of competency in French and English.
As Eram said, you need a translation into the language in which you will publish but how you deal with direct quotes depends on what you're publishing, e.g. journal article vs comissioned research report vs PhD thesis. There are associated 'rules' or specifications for different types of publication such as word limits, use of footnotes, endnotes etc. There may also be a standard/rule for including translations in your text.
It also depends on your research resources for translations. E.g. I usually do preliminary English translations (English being my first language) of other language data. I get this checked by someone who speaks the other language as first language (acknowldege the help). Where I don't speak, or have minimum grasp of, the interviewees' language, especially for commissioned research projects, I usually work with an interpreter during data collection and a translator once I have the transcripts.
In the method section, explain how you dealt with translations. If you do all the translations yourself then say something like - all translations by the author unless otherwise specified.
There are then various strategies to call on in your publication:
1. You could quote 'verbatim' from the original transcript (in French in this case) then
a) either give the (English) translation in a footnote and include the name of the translator or if it's a fairly short quote or easily summarised point
b) include the 'translation' in the paragraph that requires the quote as evidence or illustration and footnote the translator's name
2. Alternatively, quote the translated (English in this case) text and
a) footnote the translator and original language transcript text
or b) provide an appendix listing all your quotes in original language+ mention this in method along with translation procedure
or c) especially for articles with short and strict word limits (especially USA journals) limit yourself to a sentence in your method section about how you have dealt with translation and footnote this, saying people who want the original transcript data can email and ask for it!