I assume you want to translate the app into a language like Hebrew/Persian/Arabic/Urdu etc? I'm afraid the software doesn't have the css to enable it properly yet.
See https://jira.atlassian.com/browse/JRA-15355 and vote for it
If I've misunderstood your question and you aren't talking about right-to-left languages, then could you expand on the question?
I think it's more about the css in the core of the application than the .jsp files, but yes, I believe you could do it. I don't believe it's a small or simple change though, otherwise Atlassian probably would have done it a long time ago, and I think there's a lot of css to go through
I referred you to an issue about doing this in Jira, but it's linked to a Confluence issue too. I only glanced at that, but someone had attached some css files and made some suggestions that might give you some ideas.
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