is there an easy way to organise key words?
I like to group my keywords using the keyword controls:
open: Window -> show keyword controls
In the bottom of the Aperture window in the Keyword Controls , right column, select "edit buttons". Then you will see a panel that lets you assign your keywords to groups and display selected groups for easy access in the keyword controls.
The easiest way to organise keywords is to go back in time and plan the keyword structure before using it... , but we mere mortals who haven't yet invented time travel have to instead construct something and retrofit the keywords into the model.
Here's a recent post where myself and Kirby suggested some approaches. I'm a fan of using the keyword HUD (have you discovered that yet?) and a fairly strict taxonomy:
To add to the above:
A few things I do which you may find helpful.
There are no Keyword groups in Aperture, but the user can create children of Keywords. I preface all of my "Keywords w. Children" with "aa." This does two things: it forces all of them to the top of my Keywords HUD and gathers them as a group, and it identifies them to me as de facto Keyword groups. I never apply these as Keywords (in order to be in one of my Keyword groups, an Image must have assigned to it one of the Keywords in the group). This has a big advantage to me: when I filter by Keyword, I can select the "aa." Keyword, and the filter will include all Images with a child Keyword of that group.
(Trivial example: I tag Images of flowers with the name of the flower. All of the names-of-flowers Keywords are children of my Keyword "aa.Flowers". I can filter for all of my flower Images by checking "aa.Flowers" -- which is easy. Picking "Lily" and "Ranunculus" and "Gerbera" and the eighteen others in the group is not easy and is almost impossible.)
I suggest thinking this through for your needs. (For awhile I experimented with a "bb." level -- but I found this not helpful.)
Here, by way of example, is the top of one of my Keyword HUDs.
The computers (in this case) have no knowledge of or concerns for that subset of character strings we call "a language". You could employ a nineteenth-century cypher to code all your keywords, so that, for instance, "bi-valve" comes out as "eindk8dq". The only concern here is the alpha-numerical sort order, which, until I hear otherwise, I am comfortable assuming is either identical or similar enough between English and Dutch that the result will be the same.
Given your proficiency with the two languages, I'd say you could quite successfully use an idiolect created from your favorites from each.
Are such uses strictly English related, or can I use them in my native language Dutch too?
I frequently use german key words in addition to english key words, but if you export your pictures to an external editor and reimport them after editing, I recommend not to any special characters in the key words like "Umlaut" or grave. These characters usually get corrupted during the export to applications like "jet photo".