core: Add back mistakenly removed string

Change-Id: Ia56f05ebf87f16b9304fe8fa0664874fcc03697c
(cherry picked from commit 3961a05fcd41f5a2eda5877d42b351a734f3db81)
Automatic translation import

Change-Id: Ie45913a911cf7877a128c3138c347ef31009c91e
(cherry picked from commit e043348ab11ad678d1f2beac27c1d1c31a8ba2f6)
Core: Improve AOSP JA translation

They translated "hotspot" as "アクセスポイント"(access point) but it just gets us confused.
"テザリング"(Tethering) is preferred than "アクセスポイント"(access point) in Japanese translation.
FYI, most vendors fixed these strings e.g. Samsung and Sony.

Change-Id: Ic13ec6d33f411b026d90312600d0150bc3a759b0
(cherry picked from commit a31d23d03108256bedef99ba14c0bbfcf91d265f)