synsets(1542): improve pl and sl translations

[noomorph]

#72

[noomorph]

Fixed imperfective verbs in "ugasati" (fade) synset

Changes

Language	Before	After
Polish	gasić (pf.)	gasnąć, zagasać (ipf.)
Slovenian	zbledi, fade out, zaprli	ugašati se, gasiti se, bledeti
Croatian	ugasiti se (pf.), izblijediti (pf.), etc.	gasiti se, blijedjeti
Serbian	избледети, избледити, нестати, угасити (mix of pf.)	гасити се, бледети (ipf.)

Rationale

The Interslavic headword ugasati is marked as imperfective (v.intr. ipf.). All translations should match this aspect, as evidenced by other Slavic languages:

• Belarusian: згасаць
• Czech: uhasínat
• Macedonian: угаснува
• Russian: угасать
• Ukrainian: згасати