Edittools panel used to insert special characters, local templates disappeared from Telugu Wikipedia editing screens from around 14 Apr 2018. This was observed on both Firefox (59.0.2) and Chrome (64.0.3282.167 (Official Build) (64-bit)) browsers on Ubuntu 16.04.
Console messages in Firefox are as follows
JQMIGRATE: Migrate is installed with logging active, version 3.0.1
load.php:139:615
This page is using the deprecated ResourceLoader module "jquery.ui.position".
load.php:57:291
This page is using the deprecated ResourceLoader module "jquery.ui.widget".
load.php:88:942
This page is using the deprecated ResourceLoader module "jquery.ui.core".
Please use OOUI instead.
load.php:11:84
This page is using the deprecated ResourceLoader module "jquery.tipsy".
load.php:163:171
JQMIGRATE: jQuery.parseJSON is deprecated; use JSON.parse
load.php:140:200
Use of "skin" is deprecated. Use mw.config instead.
load.php:154:969