Description:
When LO has non-English (or maybe non-en-US) UI, the "Area Style / Filling" dropdown list on "Drawing Object Properties" toolbar displays a list of translated gradient names, but the chosen one is not shown as translated.  Once a gradient is chosen, instead of showing the translated name, it adds an additional entry with bracketted English name to the list, and shows that one as chosen.

Steps to reproduce:
1. Switch to a non-English UI, preferrably one with good translation coverage.  I tested simplified Chinese (zh-CN) and French (fr-FR);
2. Make sure you are using standard multi-toolbar UI (or other ways to make sure the toolbar needed in step 5 shows);
3. New Writer document, menu Insert > Shapes > Basic Shapes, choose any filled shape, say a Diamond;
4. Draw a shape on the page;
5. Now the shape is selected, the "Drawing Object Properties" toolbar is shown.  Click the first "Area Style / Filling" dropdown list (currently shows "Color"), change it to "Gradient";
6. Look at the second "Area Style / Filling" dropdown list, instead of the translated gradient name, it shows "[Pastel Bouquet]", the English name in brackets.  Click it and choose a different gradient from the translated list, afterwards the dropdown list again shows a English name in brackets.

I've reproduced this in both master (zh-CN UI only) and 7.0.2 (zh-CN and fr-FR UI).