chore: extract strings from isolation section for translation (#237)

[louix]

Wondering if can't use simpler keys (e.g. "mouseClick" over "optionsIsolationMouseClick").

At the moment they give some context, but we could limit use of them to strings only used in once place (e.g. "No Isolated Domains added yet").

We could use the description tag for ambiguous strings, for example:

"save": {
  "message": "Save",
  "description": "verb"
}

Or perhaps even:

"verbSave": {
  "message": "Save"
}

Bit of a pain when you add "optionsIsolationPerDomainMouseClickLeftMouse" and then find it's actually used elsewhere too.

[stoically]

Thanks for working on this! I'd say we keep the more descriptive ids for now, could always refactor if needed