docs(admin): shorten "Max Direct Link send rate" label to fit one line

Author: TA2k

admin/i18n/de/translations.json

@@ -106,7 +106,7 @@
     "this is not a number": "dies ist keine Zahl",
     "use common.type boolean for 1 bit enum instead of number": "common.type boolean für 1-Bit-Enum anstelle von Zahl verwenden",
     "Max Direct Link send rate [telegrams/s, 0=unlimited]": "Max. Direct-Link-Senderate [Telegramme/s, 0=unbegrenzt]",
-    "Max Direct Link send rate [telegrams/s, 0=unlimited, MDT: 2]": "Max. Direct-Link-Senderate [Telegramme/s, 0=unbegrenzt, MDT: 2]",
+    "Max Direct Link send rate [tel/s]": "Max. Direct-Link-Senderate [tel/s]",
     "Wait for ACK (check for sensitive gateways like MDT)": "Auf ACK warten (für empfindliche Gateways wie MDT aktivieren)",
     "MDT IP router — recommended steps:": "MDT IP-Router — empfohlene Schritte:",
     "ETS: enable \"Tunneling: longer monitoring interval\" (60 s keep-alive)": "ETS: Parameter \"Tunneling: längeres Überwachungsintervall\" aktivieren (60 s Keep-Alive)",

admin/index_m.html

@@ -1211,7 +1211,7 @@
                             <div class="col s12 l3 input-field">
                                 <input class="value" id="maxSendRate" type="text" />
                                 <label class="translate" for="maxSendRate"
-                                    >Max Direct Link send rate [telegrams/s, 0=unlimited, MDT: 2]</label>
+                                    >Max Direct Link send rate [tel/s]</label>
                             </div>
                             <div class="col s12" style="margin-top:12px;">
                                 <div style="border-left:3px solid #888; padding:8px 12px; background:#f5f5f5; color:#555; font-size:0.9em;">