po: update Russian translation

po: update Russian translation

Portable service stuff.

Translated "inspect portable service" as "прочитать образ переносимой
службы" ("read the portable service image"), because there is no exact
Russian analog for "inspect" ("инспектировать" has a slightly different
meaning). I think reading (some data from) images is the main job for
bus_image_common_get_metadata and bus_image_common_get_os_release, so
this translation will be more or less correct.