Comment # 1 on bug 940772 from Wolfgang Bauer

(In reply to Olaf Hering from comment #0)
> fresh TW 20150802 with gnome desktop.
> zypper in --no-recommends digikam

Well, if you use "--no-recommends", translations might be missing as they are
only recommended.

> digikam is only partly translated. The "run first time wizard" has
> "help/back/next" knobs, but also "Abbrechen" and german text for each window.

So digikam itself is translated, but not some things like the buttons in the
"run first time wizard"?

IIANM, those translations should be part of the general KDE translations, i.e.
kde-l10n-XX.

If it's digikam that misses translations, you might try to install digikam-lang
too. Maybe the translations in bundle-lang-kde are outdated, I don't know.

> The tooltips in have no text, or the content is written beige on beige.
> 
> Is a package missing or is it broken in non-kde?

This indeed sounds like a color "problem".

I just tried to run digikam in GNOME on my 13.2 system here, and it worked
fine, tooltips were readable (white on black).

You might try to set a different theme ("Design" in the german translation) in
digikam's settings menu though. openSUSE should work fine, it does here at
least. Although I don't know whether it is installed on a "pure" GNOME system,
especially if you don't install recommended packages (it's part of the package
kdebase4-runtime-branding-openSUSE in any case).
Does that help?