IN A WHILE

Albanian

nganjëherë (at times, occasionally, on and off, once, once in a while, sometimes, whiles). (various references)

Arabic 

‏من وقت لآخر (betweenwhiles, every once in a while), ‏من حين الى حين (every once in a while), ‏نادرا جدا (once in a way, once in a while). (various references)

Bulgarian 

от време на време (every so often, now and again, now and then, occasionally, off and on, once in a while, periodically). (various references)

Chinese 

偶爾 (occasionally, once in a while). (various references)

Czech

příležitostnì (casually, occasionally, once in a while), obèas (at times, every now and then, every so often, now and then, occasionally, once in a while, sometimes). (various references)

Finnish

jolloin kulloin (once in a while). (various references)

French

de temps en temps (every once in a while, once in a way), de temps à autre (every once in a while, once in a while). (various references)

German

hin und da (once in a way, once in a while), gelegentlich (occasional, casual, casually, occasionally), ab und zu (on and off, every now and then, now and then), öfters (ofttimes, on occasion, once in a way, once in a while), öfter (more often). (various references)

Greek 

σε λίγο (very soon). (various references)

Hebrew 

מזמן לזמן (every once in a while, occasionally, off and on), מדי פעם (every now and then, once in a while), פעם ב- (once in a while). (various references)

Hungarian

időnként (once in a while), ritkán (rarely, seldom), néha (every now and then, now and then, sometimes), egyszer-egyszer (every now and then, every once in a while, once in a blue moon, once in a while), alkalmanként (occassionally, once in a while, time and again). (various references)

Japanese Kanji 

時偶 (at long intervals, occasionally, once in a while, seldom), 偶に (occasionally, once in a while). (various references)

Japanese Katakana 

たまに (occasionally, once in a while), ときたま (at long intervals, occasionally, once in a while, seldom). (various references)

Manx

nish as reesht (intermittent, now and then, occasionally, on and off, once in a while). (various references)

Pig Latin

inay aay ilewhay.(various references)

Portuguese

daqui a pouco (in a little while, in awhile, just). (various references)

Romanian

din când în când (at intervals, at times, ever and anon, every now and then, every so often, from time to time, now and again, now and then, occasionally, once in a while, periodically). (various references)

Russian 

изредка (occasionally, once in a while). (various references)

Serbo-Croatian

ponekad (once in a while, sometimes). (various references)

Spanish

en todo (throughout). (various references)

Swedish

ibland (sometimes, occasionally, once in a while), då och då (at odd moments, at odd times, every now and again, every now and then, from time to time, now and then, occasionally, off and on, on and off, on occasion, once and away, once in a while). (various references)

Turkish

nadiren (every once in a while, far between, few and far, occasional, once in a while, rarely, seldom, uncommonly), arada bir (once in a while, seldom), ara sıra (between whiles, betweentimes, betweenwhiles, by snatches, ever and anon, every now and then, every once in a while, from time to time, in places, in snatches, now and again, now and then, occasionally, off and on, on and off, on occasion, once in a while, sometimes). (various references)

Ukrainian

скоро (anon, early, near, odd-come-shortly, shortly, soon), ось-ось. (various references)