Lower the battery threshold to 30% and default the cachy-update prompt to yes

The prompt offering to silence cachy-update's own update notification now
defaults to yes: once updates install themselves that notification is nothing
but noise, so the common answer should be the one you get by pressing Enter.

It also accepts "j" now. The prompt is translated, so a German user reads
"[J/n]" and types the German letter - which the old check for "y" alone
silently read as a refusal.

po/cachy-auto-update.pot

@@ -168,7 +168,7 @@ msgstr ""
 msgid "base-devel is missing - AUR packages cannot be built without it."
 msgstr ""
 
-msgid "cachy-update also notifies about available updates. Turn its notifications off? [y/N]"
+msgid "cachy-update also notifies about available updates. Turn its notifications off? [Y/n]"
 msgstr ""
 
 msgid "cachy-update's update check has been disabled."

po/de.po

@@ -169,8 +169,8 @@ msgstr "Kein AUR-Helper gefunden – für AUR-Updates paru oder yay installieren
 msgid "base-devel is missing - AUR packages cannot be built without it."
 msgstr "base-devel fehlt – ohne das lassen sich AUR-Pakete nicht bauen."
 
-msgid "cachy-update also notifies about available updates. Turn its notifications off? [y/N]"
-msgstr "cachy-update benachrichtigt ebenfalls über verfügbare Updates. Dessen Benachrichtigungen abschalten? [j/N]"
+msgid "cachy-update also notifies about available updates. Turn its notifications off? [Y/n]"
+msgstr "cachy-update benachrichtigt ebenfalls über verfügbare Updates. Dessen Benachrichtigungen abschalten? [J/n]"
 
 msgid "cachy-update's update check has been disabled."
 msgstr "Die Update-Prüfung von cachy-update wurde abgeschaltet."