Calendar: Add labels for next/previous month (#89019)

add labels for next/previous month

public/locales/en-US/grafana.json

@@ -1744,6 +1744,8 @@
       "apply-button": "Apply time range",
       "cancel-button": "Cancel",
       "close": "Close calendar",
+      "next-month": "Next month",
+      "previous-month": "Previous month",
       "select-time": "Select a time range"
     },
     "content": {

public/locales/pseudo-LOCALE/grafana.json

@@ -1744,6 +1744,8 @@
       "apply-button": "Åppľy ŧįmę řäʼnģę",
       "cancel-button": "Cäʼnčęľ",
       "close": "Cľőşę čäľęʼnđäř",
+      "next-month": "Ńęχŧ mőʼnŧĥ",
+      "previous-month": "Přęvįőūş mőʼnŧĥ",
       "select-time": "Ŝęľęčŧ ä ŧįmę řäʼnģę"
     },
     "content": {