Partial Website Translation - Strategy Debate

[ben10001]

Hi

We have a travel site with over 3000 pages in English. Of these around 200 relate to products and the rest are content articles, most of which with very low traffic.

Certain products and pages appeal directly to users in different languages (around 20-30 out of 200 for each language).

We are debating how to go about translating these pages...

If we did "oursite.com/es/product", "oursite.com/de/product", etc then users entering the site on these translated pages from Google would be limited to seeing a very cut down site, bearing in mind most speak English and would also be able to interact with our English language content we are probably losing out.

Also, if we detected user language on entry, we would show effectively hide most of our product and content from users.

Any suggestions or ideas about how to go about this without losing engagement/conversions/creating a mess?