i18n: restore key parity after the Hebrew locale

The translation parity test fails on main since the Hebrew locale
landed. Three gaps, all from catalogs drifting past each other:

The new he locale was based on an older en catalog and was missing 17
keys (pin/unpin, recipient autocomplete, attachment-upload validation,
the date_locale block, the tint_list_rows and show_folder_total_count
settings, language.sk). They are translated to Hebrew here; date_locale
keeps the same English values every other locale currently has.

The rtl_editing setting existed only in en and he - added translated to
the other 20 locales.

language.he was missing everywhere - added as the endonym "עברית" to
all locales, matching how the other language names are written.

locales/de/common.json

@@ -809,6 +809,7 @@
     "nl": "Nederlands",
     "pl": "Polski",
     "pt": "Português",
+    "he": "עברית",
     "ru": "Русский",
     "sk": "Slovenčina",
     "uk": "Українська",
@@ -1274,6 +1275,10 @@
       "return_to_list_after_action": {
         "label": "Nach Löschen oder Ungelesen-Markieren zur Liste zurückkehren",
         "description": "Nach dem Löschen oder Als-ungelesen-Markieren der geöffneten E-Mail zurück zur Liste, statt die nächste E-Mail zu öffnen."
+      },
+      "rtl_editing": {
+        "label": "Unterstützung für Rechts-nach-links-Bearbeitung",
+        "description": "Fügt der Editor-Symbolleiste eine Schreibrichtungs-Schaltfläche hinzu, mit der Absätze auf links-nach-rechts oder rechts-nach-links gestellt werden können"
       }
     },
     "composer": {