We are creating our own family crest, and would like a translation of a lyric "no freedom til we're equal". I've looked on Google Translate, but quickly realised it's going to end up reading like a dodgy tattoo. I can see that changing the wording on this slightly, gives very different translations, so I guess I'm looking for the closest in style and meaning. Any help would be appreciated.
Your motto made me recall Ovid's famous line:
Donec eris felix multos numerabis amicos.
As long as you are happy you will have many friends.
Imitating this and holding on to hexameter, I arrived at this suggestion:
Donec eris mihi par poteris tibi vivere liber.
As long as you are my equal you can live your own life free.
This is not exactly what you wished. I needed some poetic licence to fit the metric constraints, but I personally feel that hexameter makes a motto more classy.
The following phrase should suit you just fine if your desire is an entirely literal translation, rather than something more pragmatic:
Lībertās nūlla dōnec aequālēs sumus.
or Lībertātem nūllam habēbimus dōnec aequālēs sumus.
Which translates literally to:
No freedom until we are equal.
We shall have no freedom until we are equal.
I included habēbimus in the original phrase as I felt that it made more clear to whom the freedom would belong; however, it can be dropped without removing any critical meaning.
Since you mentioned that this phrase would be included in a family crest and a tattoo, you probably don't want either to have the orthography of my previously provided quote, but rather, in the orthography of Classical Latin (all capitals, lack of a letter uU, apices marking long vowels, etc):
But, the final style is obviously up to you. You can read more about the orthography of Classical Latin (with both formal and informal orthographies described) here.