YOU SAID:

Adobe Flash player was an astute program until it was replaced by HTML5, sadly.

INTO JAPANESE

残念ながら、Adobe Flash Player は HTML5 に置き換えられるまでは抜け目のないプログラムでした。

BACK INTO ENGLISH

Unfortunately, Adobe Flash Player was a savvy program until it was replaced by HTML5.

INTO JAPANESE

残念ながら、HTML5 に置き換えられるまで、Adobe Flash Player は使い慣れたプログラムでした。

BACK INTO ENGLISH

Unfortunately, Adobe Flash Player was a familiar program until it was replaced by HTML5.

INTO JAPANESE

残念ながら、HTML5 に置き換えられるまで、Adobe Flash Player はおなじみのプログラムでした。

BACK INTO ENGLISH

Unfortunately, Adobe Flash Player was a familiar program until it was replaced by HTML5.